From: Paolo Bonzini <pbonzini@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm@vger.kernel.org, Luiz Capitulino <lcapitulino@redhat.com>,
Rik van Riel <riel@redhat.com>, Radim Krcmar <rkrcmar@redhat.com>
Subject: Re: [patch 3/3] KVM: x86: add tracepoint to wait_lapic_expire
Date: Tue, 16 Dec 2014 13:19:07 +0100 [thread overview]
Message-ID: <5490233B.10109@redhat.com> (raw)
In-Reply-To: <20141216121556.GA28966@amt.cnet>
On 16/12/2014 13:15, Marcelo Tosatti wrote:
> > Let's add guest_tsc - tsc_deadline to the tracepoint. This should
> > simplify the tuning of the parameter.
>
> total_delay is very close to that, except the summands are
>
> 1000 + 1000 + ... + "remainder"
>
> Yes?
Almost: guest_tsc - tsc_deadline will be negative if the vmentry
overshot the original tsc_deadline. In that case, total_delay will be zero.
> BTW its very easy to tune the parameter with the kvm-unit-test test
> (the optimal value is clear). I'll write a document.
Nice benefit of the test. :)
Paolo
next prev parent reply other threads:[~2014-12-16 12:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-15 22:06 [patch 0/3] KVM: add option to advance tscdeadline hrtimer expiration (v4) Marcelo Tosatti
2014-12-15 22:06 ` [patch 1/3] KVM: x86: add method to test PIR bitmap vector Marcelo Tosatti
2014-12-15 22:06 ` [patch 2/3] KVM: x86: add option to advance tscdeadline hrtimer expiration Marcelo Tosatti
2014-12-16 14:34 ` Paolo Bonzini
2014-12-16 15:13 ` Marcelo Tosatti
2014-12-16 15:18 ` Paolo Bonzini
2014-12-15 22:06 ` [patch 3/3] KVM: x86: add tracepoint to wait_lapic_expire Marcelo Tosatti
2014-12-16 9:03 ` Paolo Bonzini
2014-12-16 12:15 ` Marcelo Tosatti
2014-12-16 12:19 ` Paolo Bonzini [this message]
-- strict thread matches above, loose matches on Subject: below --
2014-12-16 14:08 [patch 0/3] KVM: add option to advance tscdeadline hrtimer expiration (v5) Marcelo Tosatti
2014-12-16 14:08 ` [patch 3/3] KVM: x86: add tracepoint to wait_lapic_expire Marcelo Tosatti
2014-12-17 15:06 ` Radim Krcmar
2014-12-23 20:58 [patch 0/3] KVM: add option to advance tscdeadline hrtimer expiration (v6) Marcelo Tosatti
2014-12-23 20:58 ` [patch 3/3] KVM: x86: add tracepoint to wait_lapic_expire Marcelo Tosatti
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