From: Peter Zijlstra <peterz@infradead.org>
To: Josh Hunt <johunt@akamai.com>
Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de,
mingo@redhat.com, acme@kernel.org,
alexander.shishkin@linux.intel.com, jolsa@redhat.com,
namhyung@kernel.org, bpuranda@akamai.com
Subject: Re: [PATCH] perf/x86/intel: restrict period on Nehalem
Date: Fri, 23 Aug 2019 10:07:06 +0200 [thread overview]
Message-ID: <20190823080706.GA2369@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1566256411-18820-1-git-send-email-johunt@akamai.com>
On Mon, Aug 19, 2019 at 07:13:31PM -0400, Josh Hunt wrote:
> We see our Nehalem machines reporting 'perfevents: irq loop stuck!' in
> some cases when using perf:
>
> perfevents: irq loop stuck!
> I found that a period limit of 32 was the lowest I could set it to without
> the problem reoccurring. The idea for the patch and approach to find the
> target value were suggested by Ingo and Thomas.
>
> Signed-off-by: Josh Hunt <johunt@akamai.com>
> Reported-by: Bhupesh Purandare <bpuranda@akamai.com>
> Suggested-by: Thomas Gleixner <tglx@linutronix.de>
> Suggested-by: Ingo Molnar <mingo@redhat.com>
> Link: https://lore.kernel.org/lkml/20150501070226.GB18957@gmail.com/
> Link: https://lore.kernel.org/lkml/alpine.DEB.2.21.1908122133310.7324@nanos.tec.linutronix.de/
Thanks!
next prev parent reply other threads:[~2019-08-23 8:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-19 23:13 [PATCH] perf/x86/intel: restrict period on Nehalem Josh Hunt
2019-08-23 8:07 ` Peter Zijlstra [this message]
2019-08-31 9:06 ` [tip: perf/urgent] perf/x86/intel: Restrict " tip-bot2 for Josh Hunt
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