linux-kernel - Re: unixbench context switch perfomance & cpu topology

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Message-ID: <1516715358.8747.27.camel@gmx.de>
Date:   Tue, 23 Jan 2018 14:49:18 +0100
From:   Mike Galbraith <efault@....de>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: unixbench context switch perfomance & cpu topology

On Tue, 2018-01-23 at 18:36 +0800, Wanpeng Li wrote:
> 
> Thanks for having a try, Mike. :) Actually the two context1 tasks
> don't stack up on one logical cpu at the most of time which is
> observed by kernelshark. Do you have any idea why there is 4.5 times
> RESCHED IPIs which is mentioned in another reply for this thread?

See resched_curr().

	-Mike