linux-kernel - Re: [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world switch time

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Message-ID: <18fd2372-45d8-0bff-79e7-373a8b7d129c@redhat.com>
Date:   Wed, 3 Jul 2019 16:13:29 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [PATCH v4 1/2] KVM: LAPIC: Optimize timer latency consider world
 switch time

On 03/07/19 02:48, Wanpeng Li wrote:
> Hi Paolo, how about this patchset? Patch 2/2 is easy to take, do you
> have more concern about patch 1/2?

I don't know.  It seems somewhat hard to tune and in cyclictest it only
happens for preemption_timer=N.  Are you using preemption_timer=N
together with the LAPIC-timer-on-service-CPU patches?

Paolo