From: Avi Kivity <avi@redhat.com>
To: David Ahern <daahern@cisco.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Marcelo Tosatti <mtosatti@redhat.com>,
kvm@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: [PATCH v2 00/11] KVM in-guest performance monitoring
Date: Thu, 16 Jun 2011 19:31:04 +0300 [thread overview]
Message-ID: <4DFA2FC8.4080704@redhat.com> (raw)
In-Reply-To: <4DFA298B.9020206@cisco.com>
On 06/16/2011 07:04 PM, David Ahern wrote:
>
> On 06/16/2011 09:59 AM, Avi Kivity wrote:
> > On 06/16/2011 06:34 PM, David Ahern wrote:
> >> >
> >> > main ()
> >> > {
> >> > int i;
> >> >
> >> > fork();
> >> > fork();
> >
> > What happens without the two forks?
> >
>
> you have a 1-billion instruction benchmark since there is only 1 process.
>
I mean in terms of the overhead. Is the overhead due to context
switches being made more expensive by the pmu, or is it something else?
But there were only 337 context switches in your measurement, they
couldn't possibly be so bad.
Anyway I'll investigate it.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-06-16 17:07 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-13 13:34 [PATCH v2 00/11] KVM in-guest performance monitoring Avi Kivity
2011-06-13 13:34 ` [PATCH v2 01/11] perf: add context field to perf_event Avi Kivity
2011-06-13 13:34 ` [PATCH v2 02/11] x86, perf: add constraints for architectural PMU v1 Avi Kivity
2011-06-13 13:34 ` [PATCH v2 03/11] perf: export perf_event_refresh() to modules Avi Kivity
2011-06-13 13:34 ` [PATCH v2 04/11] KVM: Expose kvm_lapic_local_deliver() Avi Kivity
2011-06-13 13:35 ` [PATCH v2 05/11] KVM: Expose a version 1 architectural PMU to guests Avi Kivity
2011-06-13 18:10 ` David Ahern
2011-06-14 8:33 ` Avi Kivity
2011-06-27 14:10 ` lidong chen
2011-06-27 14:13 ` Avi Kivity
2011-06-28 2:54 ` lidong chen
2011-06-28 8:15 ` Avi Kivity
2011-06-13 13:35 ` [PATCH v2 06/11] KVM: Add generic RDPMC support Avi Kivity
2011-06-13 13:35 ` [PATCH v2 07/11] KVM: SVM: Intercept RDPMC Avi Kivity
2011-06-13 13:35 ` [PATCH v2 08/11] KVM: VMX: " Avi Kivity
2011-06-13 16:17 ` David Ahern
2011-06-13 16:29 ` Avi Kivity
2011-06-13 16:59 ` David Ahern
2011-06-13 17:38 ` Ingo Molnar
2011-06-13 18:09 ` David Ahern
2011-06-14 8:34 ` Avi Kivity
2011-06-14 9:27 ` Ingo Molnar
2011-06-13 13:35 ` [PATCH v2 09/11] KVM: Expose the architectural performance monitoring CPUID leaf Avi Kivity
2011-06-13 13:35 ` [PATCH v2 10/11] KVM: x86 emulator: fix RDPMC privilege check Avi Kivity
2011-06-13 13:35 ` [PATCH v2 11/11] KVM: x86 emulator: implement RDPMC (0F 33) Avi Kivity
2011-06-13 19:55 ` [PATCH v2 00/11] KVM in-guest performance monitoring David Ahern
2011-06-14 8:36 ` Avi Kivity
2011-06-14 17:15 ` David Ahern
2011-06-14 17:24 ` Jan Kiszka
2011-06-14 17:33 ` David Ahern
2011-06-14 17:48 ` David Ahern
2011-06-14 18:11 ` David Ahern
2011-06-15 8:57 ` Avi Kivity
2011-06-15 12:40 ` David Ahern
2011-06-15 13:22 ` Avi Kivity
2011-06-15 16:08 ` David Ahern
2011-06-15 16:27 ` Avi Kivity
2011-06-15 16:51 ` David Ahern
2011-06-16 13:53 ` Avi Kivity
2011-06-16 14:08 ` David Ahern
2011-06-16 14:19 ` David Ahern
2011-06-16 14:20 ` Avi Kivity
2011-06-16 14:32 ` David Ahern
2011-06-16 14:36 ` Avi Kivity
2011-06-16 15:04 ` David Ahern
2011-06-16 15:08 ` Peter Zijlstra
2011-06-16 15:18 ` David Ahern
2011-06-16 15:19 ` David Ahern
2011-06-16 15:27 ` Peter Zijlstra
2011-06-16 15:34 ` David Ahern
2011-06-16 15:59 ` Avi Kivity
2011-06-16 16:04 ` David Ahern
2011-06-16 16:31 ` Avi Kivity [this message]
2011-06-16 17:16 ` David Ahern
2011-06-29 7:52 ` Avi Kivity
2011-06-29 8:38 ` Peter Zijlstra
2011-06-29 9:26 ` Avi Kivity
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