From: Paolo Bonzini <pbonzini@redhat.com>
To: Gleb Natapov <gleb@kernel.org>
Cc: Avi Kivity <avi.kivity@gmail.com>,
Andy Lutomirski <luto@amacapital.net>,
kvm list <kvm@vger.kernel.org>
Subject: Re: Seeking a KVM benchmark
Date: Wed, 12 Nov 2014 16:51:56 +0100 [thread overview]
Message-ID: <5463821C.2020900@redhat.com> (raw)
In-Reply-To: <20141112153230.GD26187@minantech.com>
On 12/11/2014 16:32, Gleb Natapov wrote:
> > > > userspace exit, urn 17560 17726 17628 17572 17417
> > > > lightweight exit, urn 3316 3342 3342 3319 3328
> > > > userspace exit, LOAD_EFER, guest!=host 12200 11772 12130 12164 12327
> > > > lightweight exit, LOAD_EFER, guest!=host 3214 3220 3238 3218 3337
> > > > userspace exit, LOAD_EFER, guest=host 11983 11780 11920 11919 12040
> > > > lightweight exit, LOAD_EFER, guest=host 3178 3193 3193 3187 3220
> > >
> > > Is this with Andy's patch that skips LOAD_EFER when guest=host, or the one
> > > that always switch LOAD_EFER?
> >
> > Skip LOAD_EFER when guest=host.
>
> So guest=host is a little bit better than guest!=host so looks like
> skipping LOAD_EFER helps, but why "lightweight exit, urn" worse than
> guest=host though, it should be exactly the same as long as NX bit is
> the same in urn test, no?
I don't know---it is very much reproducible though. It is not my
machine so I cannot run perf on it, but I can try to find a similar one
in the next few days.
Paolo
next prev parent reply other threads:[~2014-11-12 15:52 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-07 6:27 Seeking a KVM benchmark Andy Lutomirski
2014-11-07 7:17 ` Paolo Bonzini
2014-11-07 17:59 ` Andy Lutomirski
2014-11-07 18:11 ` Andy Lutomirski
2014-11-08 12:01 ` Gleb Natapov
2014-11-08 16:00 ` Andy Lutomirski
2014-11-08 16:44 ` Andy Lutomirski
2014-11-09 8:52 ` Gleb Natapov
2014-11-09 16:36 ` Andy Lutomirski
2014-11-10 10:03 ` Paolo Bonzini
2014-11-10 10:45 ` Gleb Natapov
2014-11-10 12:15 ` Paolo Bonzini
2014-11-10 14:23 ` Avi Kivity
2014-11-10 17:28 ` Paolo Bonzini
2014-11-10 17:38 ` Gleb Natapov
2014-11-12 11:33 ` Paolo Bonzini
2014-11-12 15:22 ` Gleb Natapov
2014-11-12 15:26 ` Paolo Bonzini
2014-11-12 15:32 ` Gleb Natapov
2014-11-12 15:51 ` Paolo Bonzini [this message]
2014-11-12 16:07 ` Andy Lutomirski
2014-11-12 17:56 ` Paolo Bonzini
2014-11-17 11:17 ` Wanpeng Li
2014-11-17 11:18 ` Paolo Bonzini
2014-11-17 12:00 ` Wanpeng Li
2014-11-17 12:04 ` Paolo Bonzini
2014-11-17 12:14 ` Wanpeng Li
2014-11-17 12:22 ` Paolo Bonzini
2014-11-11 11:07 ` Paolo Bonzini
2014-11-10 19:17 ` Andy Lutomirski
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