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* DPDK on isolated cores but I still see interrupts
@ 2022-03-01 14:52 Antonio Di Bacco
  2022-03-01 15:16 ` Kinsella, Ray
  2022-03-01 15:31 ` Cliff Burdick
  0 siblings, 2 replies; 4+ messages in thread
From: Antonio Di Bacco @ 2022-03-01 14:52 UTC (permalink / raw)
  To: users

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I am trying to run a DPDK application on x86_64 Machine (Ubuntu 20.04) on
isolated cores.
I expected not to have interrupts on isolated cores but I still have a lot
of CAL (*Function call interrupts*) interrupts and LOC interrupts (*Local
timer interrupts*). Is there any setting in DPDK to stop those too?

Regards.

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^ permalink raw reply	[flat|nested] 4+ messages in thread

* RE: DPDK on isolated cores but I still see interrupts
  2022-03-01 14:52 DPDK on isolated cores but I still see interrupts Antonio Di Bacco
@ 2022-03-01 15:16 ` Kinsella, Ray
  2022-03-01 16:37   ` Stephen Hemminger
  2022-03-01 15:31 ` Cliff Burdick
  1 sibling, 1 reply; 4+ messages in thread
From: Kinsella, Ray @ 2022-03-01 15:16 UTC (permalink / raw)
  To: Antonio Di Bacco, users

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Can you supply “cat /proc/cmdline” please?

Ray K

From: Antonio Di Bacco <a.dibacco.ks@gmail.com>
Sent: Tuesday 1 March 2022 14:52
To: users@dpdk.org
Subject: DPDK on isolated cores but I still see interrupts

I am trying to run a DPDK application on x86_64 Machine (Ubuntu 20.04) on isolated cores.
I expected not to have interrupts on isolated cores but I still have a lot of CAL (Function call interrupts) interrupts and LOC interrupts (Local timer interrupts). Is there any setting in DPDK to stop those too?

Regards.

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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: DPDK on isolated cores but I still see interrupts
  2022-03-01 14:52 DPDK on isolated cores but I still see interrupts Antonio Di Bacco
  2022-03-01 15:16 ` Kinsella, Ray
@ 2022-03-01 15:31 ` Cliff Burdick
  1 sibling, 0 replies; 4+ messages in thread
From: Cliff Burdick @ 2022-03-01 15:31 UTC (permalink / raw)
  To: Antonio Di Bacco; +Cc: users

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One thing you can try is using the irqaffinity boot parameter to force
interrupts onto your non-isolated cores: For timer interrupts you can try
running in NO_HZ_FULL mode, but that may not work if you have other
userspace processes running on those cores. It might be worth confirming
that the interrupts are actually causing noticeable problems first before
trying to move the interrupts.

On Tue, Mar 1, 2022 at 6:52 AM Antonio Di Bacco <a.dibacco.ks@gmail.com>
wrote:

> I am trying to run a DPDK application on x86_64 Machine (Ubuntu 20.04) on
> isolated cores.
> I expected not to have interrupts on isolated cores but I still have a lot
> of CAL (*Function call interrupts*) interrupts and LOC interrupts (*Local
> timer interrupts*). Is there any setting in DPDK to stop those too?
>
> Regards.
>

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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: DPDK on isolated cores but I still see interrupts
  2022-03-01 15:16 ` Kinsella, Ray
@ 2022-03-01 16:37   ` Stephen Hemminger
  0 siblings, 0 replies; 4+ messages in thread
From: Stephen Hemminger @ 2022-03-01 16:37 UTC (permalink / raw)
  To: Kinsella, Ray; +Cc: Antonio Di Bacco, users

On Tue, 1 Mar 2022 15:16:32 +0000
"Kinsella, Ray" <ray.kinsella@intel.com> wrote:

> Can you supply “cat /proc/cmdline” please?
> 
> Ray K
> 
> From: Antonio Di Bacco <a.dibacco.ks@gmail.com>
> Sent: Tuesday 1 March 2022 14:52
> To: users@dpdk.org
> Subject: DPDK on isolated cores but I still see interrupts
> 
> I am trying to run a DPDK application on x86_64 Machine (Ubuntu 20.04) on isolated cores.
> I expected not to have interrupts on isolated cores but I still have a lot of CAL (Function call interrupts) interrupts and LOC interrupts (Local timer interrupts). Is there any setting in DPDK to stop those too?
> 
> Regards.

Some other notes:
  - don't use CPU 0. The kernel needs/wants to run things there
  - You may need to change softirq and workqueue settings (see /sys/devices/virtual/workqueue)


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2022-03-01 16:37 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-03-01 14:52 DPDK on isolated cores but I still see interrupts Antonio Di Bacco
2022-03-01 15:16 ` Kinsella, Ray
2022-03-01 16:37   ` Stephen Hemminger
2022-03-01 15:31 ` Cliff Burdick

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