[USRP-users] X3x0 PCIe ExpressCard benchmark_rate transmit test rate limit

Michael West michael.west at ettus.com
Mon Sep 22 17:04:58 EDT 2014


Hi Stan,

I think your conclusion is correct that it is an issue with the laptop,
card, or cable.  Unfortunately, I cannot think of a way to isolate it
without swapping out components.

Regards,
Michael

On Mon, Sep 22, 2014 at 1:44 PM, Stan Vitebsky via USRP-users <
usrp-users at lists.ettus.com> wrote:

>  Hi Michael,
>
> I am getting the same results (~1.427Msps with benchmark_rate
> --tx_rate=25e6) with the following configuration on my laptop (Eurocom
> Panther 5SE):
>
> Ubuntu 13.10 (kernel 3.11.0)
> UHD 3.7.2
> NI-USRP-RIO Driver:
>
> $ modinfo nikal
> filename:
> /lib/modules/3.11.0-12-generic/kernel/natinst/nikal/nikal.ko
> description:    National Instruments Kernel Abstraction Layer
> author:         National Instruments Corporation
> license:        Copyright (c) 2002-2014 National Instruments Corporation.
> All Rights Reserved.  Any and all use of the copyrighted materials is
> subject to the then current terms and conditions of the applicable license
> agreement, which can be found at <http://www.ni.com/linux/>.
> srcversion:     4084E53CA60B8FA4BEC7FDE
> depends:
> vermagic:     3.11.0-12-generic SMP mod_unload modversions
>
> I think this should be close enough to your configuration to eliminate the
> OS/driver factors.
>
> Since I already ran this with 2 different X300, I am guessing the problem
> must be with either the laptop, the card or the cable ?
> If you have any other ideas to how to isolate the problem (without buying
> new hardware), I'd really appreciate hearing about them.
>
> Thanks,
> -Stan
>
>
>
>
>
>
>
>
> On 9/22/14, 10:56 AM, Stan Vitebsky via USRP-users wrote:
>
> Hi Michael,
>
> Thank you very much for your reply.
> Just in case, I reinstalled the niusrprio driver again, but I am still
> getting the same result (1.4682Msps limit with 99 underruns for 25Msps/ 10
> sec benchmark_rate test)
>
> my info is
> $ modinfo nikal
> filename:
> /lib/modules/3.10.33-rt32.45.el6rt.x86_64/kernel/natinst/nikal/nikal.ko
> description:    National Instruments Kernel Abstraction Layer
> author:         National Instruments Corporation
> license:        Copyright (c) 2002-2014 National Instruments Corporation.
> All Rights Reserved.  Any and all use of the copyrighted materials is
> subject to the then current terms and conditions of the applicable license
> agreement, which can be found at <http://www.ni.com/linux/>.
> srcversion:     4084E53CA60B8FA4BEC7FDE
> depends:
> vermagic:     3.10.33-rt32.45.el6rt.x86_64 SMP preempt mod_unload
>
> I guess, I will try to reproduce your configuration and see what happens.
> -Stan
>
>
> On 9/19/14, 10:09 PM, Michael West wrote:
>
>  Hi Stan,
>
>  I just tested on my system and was able to achieve 25 Msps on transmit
> for 60 seconds with no issues (benchmark_rate --tx_rate=25e6
> --duration=60).  Here is my configuration:
>
> System:  Lenovo T430s laptop
> Express Card:  NI Express Card-8360
> OS:  Ubuntu 13.04 (kernel 3.11.6)
> UHD:  3.7.2
>  NI-USRP-RIO Driver:
>
> $ modinfo nikal
> filename:
> /lib/modules/3.11.6-low-latency-1k-ticks/kernel/natinst/nikal/nikal.ko
> description:    National Instruments Kernel Abstraction Layer
> author:         National Instruments Corporation
> license:        Copyright (c) 2002-2014 National Instruments Corporation.
> All Rights Reserved.  Any and all use of the copyrighted materials is
> subject to the then current terms and conditions of the applicable license
> agreement, which can be found at <http://www.ni.com/linux/>.
> srcversion:     21BCF3919A528389FB9E52A
> depends:
>
>  Which version of niusrprio driver are you using?
>
>  Regards,
> Michael
>
>
>
> On Fri, Sep 19, 2014 at 1:59 PM, Stan Vitebsky via USRP-users <
> usrp-users at lists.ettus.com> wrote:
>
>>  Hello,
>>
>> Could somebody in the community please point me to the host configuration
>> (laptop, OS, uhd, system settings) that worked for them with x3x0 and
>> ExpressCard at tx rates above 1.4Msps (e.g. using benchmark_rate)?
>> Has this been proven to work by anybody? If yes, I'd appreciate your
>> guidance.
>>
>> Thanks,
>> -Stan
>>
>>  and ExpressCard
>>
>>
>>
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>>
>>
>
>
>
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