[USRP-users] Installing PCIE drivers for x310
james.humphries at ettus.com
Thu Oct 29 21:32:59 EDT 2015
Ok, so it looks like the default update rate for dstat is 1 second. In that
case, I was seeing 30k interrupts per second on my machine. It would made
sense that you should be seeing a similar number.
Could you post the output of (or just the output that concerns the NI
$ sudo lspci -vv
I'm curious if, as you pointed out, that the PCIe slot is negotiating a 1x
bus for some reason. Are there any other devices on the PCIe bus? Video
card or other adaptors?
On Thu, Oct 29, 2015 at 9:06 PM, Jared Dulmage via USRP-users <
usrp-users at lists.ettus.com> wrote:
> When I run
> > benchmark_rate --rx_rate 50e6
> dstat -crimp shows around 7500 interrupts/sec. I get no overflows but
> this is much lower than the rate Marcus predicted. Perhaps due to a 4 lane
> PCIe interface instead of 1 lane?
> When I run
> > benchmark_rate --rx_rate 100e6
> I get around 5500 interrupts/sec. So I think that might be something I
> need to investigate. Can you tell me what
> > cat /proc/irq/<# niusrpriok irq>/smp_affinity
> > cat /proc/irq/<# niusrpriok irq>/smp_affinity_list
> where <# niusrpriok irq> is the interrupt for niusrpiok in
> /proc/interrupts on your setup?
> Mine says
> > cat /proc/irq/90/smp_affinity
> > cat /proc/irq/90/smp_affinity_list
> which I think might be causing the problem. Nope, just checked in
> /proc/interrupts, all of the interrupts for 90 are serviced by core 0.
> Perhaps I need to get multiple cores servicing the interrupts? Scratching
> my head again.
> Thanks for all the help guys,
> Jared Dulmage
> Engineering Specialist
> Digital Comm. and Implementation Dept.
> Aerospace Corporation
> USRP-users mailing list
> USRP-users at lists.ettus.com
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