linux-kernel - Re: Steal time accounting in KVM. Benchmark.

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Message-ID: <BLU436-SMTP2200C7E25E10FBAAC58475B80200@phx.gbl>
Date:	Thu, 29 Oct 2015 17:49:39 +0800
From:	Wanpeng Li <wanpeng.li@...mail.com>
To:	Alexey Makhalov <makhaloff@...il.com>,
	Paolo Bonzini <pbonzini@...hat.com>
CC:	kvm <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: Steal time accounting in KVM. Benchmark.

Hi Paolo,
On 10/24/15 10:03 AM, Alexey Makhalov wrote:
>   What I figured out.
> It happens in intersection of 3 features:
> *irq time accounting
> *stolen time accounting
> *linux guest with tickless idle only (not fully tickless)
>
> Looks like timer interrupts storm is happening during this benchmark
> (with 2:1 cpu overcommit). irq time accounting gets crazy. Even 'top'
> shows weird statistic: 50% hi, 50% st, ~0% user, spinning processes
> use ~0% cpu - that is not correct.

If this is the desired behavior or something need to improve?

Regards,
Wanpeng Li
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