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X310 slow with gnuradio

EH
Erik Heinz
Mon, Jul 29, 2019 11:30 AM

Hi,

I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a

"UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse.

The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well.

The processor is an Intel core i3-7100 @3.9GHz.  A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster.

Any ideas? Could an update to a more recent gnuradio version help?

Best regards,

Erik

Hi, I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a "UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse. The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well. The processor is an Intel core i3-7100 @3.9GHz. A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster. Any ideas? Could an update to a more recent gnuradio version help? Best regards, Erik
JM
Jason Matusiak
Mon, Jul 29, 2019 11:50 AM

Shot in the dark Erik:
What is your MTU set at for the ethernet port?  Try setting it to 9000 if it isn't and see if that does anything for you.

From: USRP-users usrp-users-bounces@lists.ettus.com on behalf of Erik Heinz via USRP-users usrp-users@lists.ettus.com
Sent: Monday, July 29, 2019 7:30 AM
To: usrp-users@lists.ettus.com usrp-users@lists.ettus.com
Subject: [USRP-users] X310 slow with gnuradio

Hi,

I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a

"UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse.

The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well.

The processor is an Intel core i3-7100 @3.9GHz.  A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster.

Any ideas? Could an update to a more recent gnuradio version help?

Best regards,

Erik

Shot in the dark Erik: What is your MTU set at for the ethernet port? Try setting it to 9000 if it isn't and see if that does anything for you. ________________________________ From: USRP-users <usrp-users-bounces@lists.ettus.com> on behalf of Erik Heinz via USRP-users <usrp-users@lists.ettus.com> Sent: Monday, July 29, 2019 7:30 AM To: usrp-users@lists.ettus.com <usrp-users@lists.ettus.com> Subject: [USRP-users] X310 slow with gnuradio Hi, I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a "UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse. The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well. The processor is an Intel core i3-7100 @3.9GHz. A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster. Any ideas? Could an update to a more recent gnuradio version help? Best regards, Erik
EH
Erik Heinz
Mon, Jul 29, 2019 12:02 PM

Hi jason,

I had the MTU set to 8028. I increased to 9000, just to make sure -> no change.

As I wrote, the UHD driver itself can transmit at full speed, so it should be no network issue.

Best regards,

Erik

Von: Jason Matusiak jason@gardettoengineering.com
Gesendet: Montag, 29. Juli 2019 13:50
An: usrp-users@lists.ettus.com; Erik Heinz
Betreff: Re: X310 slow with gnuradio

Shot in the dark Erik:
What is your MTU set at for the ethernet port?  Try setting it to 9000 if it isn't and see if that does anything for you.

From: USRP-users usrp-users-bounces@lists.ettus.com on behalf of Erik Heinz via USRP-users usrp-users@lists.ettus.com
Sent: Monday, July 29, 2019 7:30 AM
To: usrp-users@lists.ettus.com usrp-users@lists.ettus.com
Subject: [USRP-users] X310 slow with gnuradio

Hi,

I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a

"UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse.

The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well.

The processor is an Intel core i3-7100 @3.9GHz.  A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster.

Any ideas? Could an update to a more recent gnuradio version help?

Best regards,

Erik

Hi jason, I had the MTU set to 8028. I increased to 9000, just to make sure -> no change. As I wrote, the UHD driver itself can transmit at full speed, so it should be no network issue. Best regards, Erik ________________________________ Von: Jason Matusiak <jason@gardettoengineering.com> Gesendet: Montag, 29. Juli 2019 13:50 An: usrp-users@lists.ettus.com; Erik Heinz Betreff: Re: X310 slow with gnuradio Shot in the dark Erik: What is your MTU set at for the ethernet port? Try setting it to 9000 if it isn't and see if that does anything for you. ________________________________ From: USRP-users <usrp-users-bounces@lists.ettus.com> on behalf of Erik Heinz via USRP-users <usrp-users@lists.ettus.com> Sent: Monday, July 29, 2019 7:30 AM To: usrp-users@lists.ettus.com <usrp-users@lists.ettus.com> Subject: [USRP-users] X310 slow with gnuradio Hi, I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a "UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse. The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well. The processor is an Intel core i3-7100 @3.9GHz. A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster. Any ideas? Could an update to a more recent gnuradio version help? Best regards, Erik
JM
Jason Matusiak
Mon, Jul 29, 2019 12:10 PM

Erik,

Whoops, I glazed over that point, sorry.  I am not really sure what else to try.  That is a pretty old version of GR, could you maybe try a newer version in a different directory/prefix (so it doesn't mess up your current build)?  At what sample rate do things seem to work right again?

From: Erik Heinz erik.heinz@supracon.com
Sent: Monday, July 29, 2019 8:02 AM
To: Jason Matusiak jason@gardettoengineering.com; usrp-users@lists.ettus.com usrp-users@lists.ettus.com
Subject: AW: X310 slow with gnuradio

Hi jason,

I had the MTU set to 8028. I increased to 9000, just to make sure -> no change.

As I wrote, the UHD driver itself can transmit at full speed, so it should be no network issue.

Best regards,

Erik

Von: Jason Matusiak jason@gardettoengineering.com
Gesendet: Montag, 29. Juli 2019 13:50
An: usrp-users@lists.ettus.com; Erik Heinz
Betreff: Re: X310 slow with gnuradio

Shot in the dark Erik:
What is your MTU set at for the ethernet port?  Try setting it to 9000 if it isn't and see if that does anything for you.

From: USRP-users usrp-users-bounces@lists.ettus.com on behalf of Erik Heinz via USRP-users usrp-users@lists.ettus.com
Sent: Monday, July 29, 2019 7:30 AM
To: usrp-users@lists.ettus.com usrp-users@lists.ettus.com
Subject: [USRP-users] X310 slow with gnuradio

Hi,

I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a

"UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse.

The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well.

The processor is an Intel core i3-7100 @3.9GHz.  A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster.

Any ideas? Could an update to a more recent gnuradio version help?

Best regards,

Erik

Erik, Whoops, I glazed over that point, sorry. I am not really sure what else to try. That is a pretty old version of GR, could you maybe try a newer version in a different directory/prefix (so it doesn't mess up your current build)? At what sample rate do things seem to work right again? ________________________________ From: Erik Heinz <erik.heinz@supracon.com> Sent: Monday, July 29, 2019 8:02 AM To: Jason Matusiak <jason@gardettoengineering.com>; usrp-users@lists.ettus.com <usrp-users@lists.ettus.com> Subject: AW: X310 slow with gnuradio Hi jason, I had the MTU set to 8028. I increased to 9000, just to make sure -> no change. As I wrote, the UHD driver itself can transmit at full speed, so it should be no network issue. Best regards, Erik ________________________________ Von: Jason Matusiak <jason@gardettoengineering.com> Gesendet: Montag, 29. Juli 2019 13:50 An: usrp-users@lists.ettus.com; Erik Heinz Betreff: Re: X310 slow with gnuradio Shot in the dark Erik: What is your MTU set at for the ethernet port? Try setting it to 9000 if it isn't and see if that does anything for you. ________________________________ From: USRP-users <usrp-users-bounces@lists.ettus.com> on behalf of Erik Heinz via USRP-users <usrp-users@lists.ettus.com> Sent: Monday, July 29, 2019 7:30 AM To: usrp-users@lists.ettus.com <usrp-users@lists.ettus.com> Subject: [USRP-users] X310 slow with gnuradio Hi, I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a "UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse. The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well. The processor is an Intel core i3-7100 @3.9GHz. A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster. Any ideas? Could an update to a more recent gnuradio version help? Best regards, Erik
MD
Marcus D. Leech
Mon, Jul 29, 2019 3:36 PM

On 07/29/2019 07:30 AM, Erik Heinz via USRP-users wrote:

Hi,

I am getting lots of underflow errors when sending with gnuradio to an
X310 at sampling rates of 50 MSps and higher. The flowchart is as
simple as possible: a signal source and a

"UHD: USRP Sink" block. When sending and receiving at the same
time, the performance is even worse.

The X310 is connected to the PC by 10G ethernet. Using the UHD example
programs benchmark_rate, tx_waveforms, txrx_loopback_to_file
etc., a sampling rate of 200 MSps full duplex is no problem at all. So
it is not a problem of the UHD driver and the network setup should
be OK as well.

The processor is an Intel core i3-7100 @3.9GHz.  A gnuradio flowchart
with a signal source, a throttle block and a file sink works at 50
MSps sampling rate and more, so the processor speed should not be a
problem either. The gnuradio version is 3.7.11 which is the one
currently distributed for Ubuntu buster.

Any ideas? Could an update to a more recent gnuradio version help?

Best regards,

Erik

The file-sink version is NOT a good comparison, since the filesystem
doesn't need samples to "arrive on time", so there's no concept of an
"under-run".

The signal source in Gnu Radio is not super-speedy, particularly if it's
generating a sin or cos function.

Also, the core i3-7100, despite the high clock rate, doesn't perform
nearly as well as the i7 series, which is what most people choose for doing
serious high-speed DSP work with Gnu Radio.

On 07/29/2019 07:30 AM, Erik Heinz via USRP-users wrote: > > Hi, > > > I am getting lots of underflow errors when sending with gnuradio to an > X310 at sampling rates of 50 MSps and higher. The flowchart is as > simple as possible: a signal source and a > > "UHD: USRP Sink" block. When sending and receiving at the same > time, the performance is even worse. > > > The X310 is connected to the PC by 10G ethernet. Using the UHD example > programs benchmark_rate, tx_waveforms, txrx_loopback_to_file > etc., a sampling rate of 200 MSps full duplex is no problem at all. So > it is not a problem of the UHD driver and the network setup should > be OK as well. > > > The processor is an Intel core i3-7100 @3.9GHz. A gnuradio flowchart > with a signal source, a throttle block and a file sink works at 50 > MSps sampling rate and more, so the processor speed should not be a > problem either. The gnuradio version is 3.7.11 which is the one > currently distributed for Ubuntu buster. > > > Any ideas? Could an update to a more recent gnuradio version help? > > > Best regards, > > Erik > > > The file-sink version is NOT a good comparison, since the filesystem doesn't need samples to "arrive on time", so there's no concept of an "under-run". The signal source in Gnu Radio is not super-speedy, particularly if it's generating a sin or cos function. Also, the core i3-7100, despite the high clock rate, doesn't perform nearly as well as the i7 series, which is what most people choose for doing serious high-speed DSP work with Gnu Radio.
EH
Erik Heinz
Tue, Jul 30, 2019 4:07 PM

Unfortunately, I have to stick to the i3 for now, since it is the only PC here with an PCI-E slot for the 10 Gig ethernet.

Anyway, I have installed UHD_3.14.1 from the Ettus repository and compiled gnuradio-3.8.0.0-rc2. Now things look a bit better.

A flowchart with a Signal Source, an UHD USRP Sink, an UHD USRP source and a QT GUI Sink works up to 66.7 MSPS duplex (the X310 can only do samples rates that are integer fractions of 200 MHz).
With a constant source, 100 MSPS are possible.
With sender-only or receiver-only flowcharts, I can achieve 200 MSPS. Not so bad.

Best regards,
Erik

--
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Supracon AG
Dr. Erik Heinz
An der Lehmgrube 11
07751 Jena
Tel.: +49 3641 2328-165
Fax: +49 3641 2328-109
Internet: http://www.supracon.com
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Kaufm. Vorstand:      Matthias Meyer
Vorsitz Aufsichtsrat:  Prof. Dr. Michael Siegel

Von: USRP-users usrp-users-bounces@lists.ettus.com im Auftrag von Marcus D. Leech via USRP-users usrp-users@lists.ettus.com
Gesendet: Montag, 29. Juli 2019 17:36
An: usrp-users@lists.ettus.com
Betreff: Re: [USRP-users] X310 slow with gnuradio

On 07/29/2019 07:30 AM, Erik Heinz via USRP-users wrote:

Hi,

I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a

"UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse.

The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well.

The processor is an Intel core i3-7100 @3.9GHz.  A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster.

Any ideas? Could an update to a more recent gnuradio version help?

Best regards,

Erik

The file-sink version is NOT a good comparison, since the filesystem doesn't need samples to "arrive on time", so there's no concept of an
"under-run".

The signal source in Gnu Radio is not super-speedy, particularly if it's generating a sin or cos function.

Also, the core i3-7100, despite the high clock rate, doesn't perform nearly as well as the i7 series, which is what most people choose for doing
serious high-speed DSP work with Gnu Radio.

Unfortunately, I have to stick to the i3 for now, since it is the only PC here with an PCI-E slot for the 10 Gig ethernet. Anyway, I have installed UHD_3.14.1 from the Ettus repository and compiled gnuradio-3.8.0.0-rc2. Now things look a bit better. A flowchart with a Signal Source, an UHD USRP Sink, an UHD USRP source and a QT GUI Sink works up to 66.7 MSPS duplex (the X310 can only do samples rates that are integer fractions of 200 MHz). With a constant source, 100 MSPS are possible. With sender-only or receiver-only flowcharts, I can achieve 200 MSPS. Not so bad. Best regards, Erik -- ???????????????????????????????????????? Supracon AG Dr. Erik Heinz An der Lehmgrube 11 07751 Jena Tel.: +49 3641 2328-165 Fax: +49 3641 2328-109 Internet: http://www.supracon.com ???????????????????????????????????????? Handelsregister: Amtsgericht Gera HRB 208970 Umsatzsteuer-Id.: DE 216 111 685 Kaufm. Vorstand: Matthias Meyer Vorsitz Aufsichtsrat: Prof. Dr. Michael Siegel ________________________________ Von: USRP-users <usrp-users-bounces@lists.ettus.com> im Auftrag von Marcus D. Leech via USRP-users <usrp-users@lists.ettus.com> Gesendet: Montag, 29. Juli 2019 17:36 An: usrp-users@lists.ettus.com Betreff: Re: [USRP-users] X310 slow with gnuradio On 07/29/2019 07:30 AM, Erik Heinz via USRP-users wrote: Hi, I am getting lots of underflow errors when sending with gnuradio to an X310 at sampling rates of 50 MSps and higher. The flowchart is as simple as possible: a signal source and a "UHD: USRP Sink" block. When sending and receiving at the same time, the performance is even worse. The X310 is connected to the PC by 10G ethernet. Using the UHD example programs benchmark_rate, tx_waveforms, txrx_loopback_to_file etc., a sampling rate of 200 MSps full duplex is no problem at all. So it is not a problem of the UHD driver and the network setup should be OK as well. The processor is an Intel core i3-7100 @3.9GHz. A gnuradio flowchart with a signal source, a throttle block and a file sink works at 50 MSps sampling rate and more, so the processor speed should not be a problem either. The gnuradio version is 3.7.11 which is the one currently distributed for Ubuntu buster. Any ideas? Could an update to a more recent gnuradio version help? Best regards, Erik The file-sink version is NOT a good comparison, since the filesystem doesn't need samples to "arrive on time", so there's no concept of an "under-run". The signal source in Gnu Radio is not super-speedy, particularly if it's generating a sin or cos function. Also, the core i3-7100, despite the high clock rate, doesn't perform nearly as well as the i7 series, which is what most people choose for doing serious high-speed DSP work with Gnu Radio.
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