From: David Ahern <daahern@cisco.com>
To: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
kvm@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: [PATCH v2 00/11] KVM in-guest performance monitoring
Date: Thu, 16 Jun 2011 09:04:12 -0600 [thread overview]
Message-ID: <4DFA1B6C.8040309@cisco.com> (raw)
In-Reply-To: <4DFA14F8.2060109@redhat.com>
On 06/16/2011 08:36 AM, Avi Kivity wrote:
> On 06/16/2011 05:32 PM, David Ahern wrote:
>> Seems to be a side effect of running perf-stat in the guest. Running
>> just 'openssl speed aes' in both host and guest shows very similar
>> numbers (for the first 3 columns). Adding the 'perf stat' to the command
>> (ie., perf stat openssl speed aes) causes a significant decline in the
>> guest - by a factor of 2. For comparison 'perf stat' in the host has a
>> negligible impact.
>
> That's pretty bad. I'll investigate.
>
Before I let this go for the day ....
Running perf in the host shows arch_local_irq_enable is a lot more
prevalent when adding 'perf stat' to the command in the guest.
David
next prev parent reply other threads:[~2011-06-16 15:04 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 [this message]
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
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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