mlx4en, timer irq @100%...
Hans Petter Selasky
hps at selasky.org
Fri Aug 4 17:05:00 UTC 2017
On 08/04/17 18:59, Ben RUBSON wrote:
> Hello,
>
> Not sure this is the right list, but as it seems related to a mlx4en device...
>
> # vmstat -i 1
> (...)
> interrupt total rate
> cpu23:timer 1198 1127
>
> # top -P ALL
> (...)
> CPU 23: 0.0% user, 0.0% nice, 0.0% system, 100% interrupt, 0.0% idle
>
> # netstat -I mlxen0 -d -w 1
> input mlxen0 output
> packets errs idrops bytes packets errs bytes colls drops
> (and not output at all, same for mlxen1 !)
>
> # uname -sr
> FreeBSD 11.0-RELEASE-p9
>
> So, as you can see, one of my CPUs is used at 100% by timer interrupts,
> since about 2 hours, and suddenly.
> Initiating network connections to this server is now slow.
> And what I found is that I can't use netstat on my 2 mlx4en devices anymore
> (my monitoring tool is then no more fed).
>
> sysctl hw.mlxen0 is OK, no errors, and trafic counters grow slowly.
>
> What should I do ?
> How to investigate on this ?
>
> Thank you very much for your help & support,
>
Hi,
Try "procstat -ak". It should give an idea what is going on.
What version of FreeBSD is this?
Is this a regression issue?
--HPS
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