From: Avi Kivity <avi@redhat.com>
To: Udo Lembke <ulembke@polarzone.de>
Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org
Subject: Re: [PATCH 10/12] kvm: enable smp > 1
Date: Thu, 20 May 2010 09:12:56 +0300 [thread overview]
Message-ID: <4BF4D2E8.2090607@redhat.com> (raw)
In-Reply-To: <4BF443EA.3020405@polarzone.de>
On 05/19/2010 11:02 PM, Udo Lembke wrote:
>> Unrelated, what are your smp issues?
>>
>
> If i use one cpu i got a good io-performance:
> e.g. over 500MB/s at the profile "install" of the io-benchmark
> h2benchw.exe.
> ( aio=threads | SAS-Raid-0 |
> ftp://ftp.heise.de/pub/ct/ctsi/h2benchw.zip | hwbenchw.exe -p -w
> iotest 0)
> The same test but with two cpus gives results between 27 and 298 MB/s!
>
> Also in real life it's noticeable not only with an benchmark. I use a
> win-vm with two cpu for postscript-ripping and have a performance drop
> due to the bad io.
What's your block device model? virtio or ide?
What does cpu usage look like on guest or host?
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Udo Lembke <ulembke@polarzone.de>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: [Qemu-devel] Re: [PATCH 10/12] kvm: enable smp > 1
Date: Thu, 20 May 2010 09:12:56 +0300 [thread overview]
Message-ID: <4BF4D2E8.2090607@redhat.com> (raw)
In-Reply-To: <4BF443EA.3020405@polarzone.de>
On 05/19/2010 11:02 PM, Udo Lembke wrote:
>> Unrelated, what are your smp issues?
>>
>
> If i use one cpu i got a good io-performance:
> e.g. over 500MB/s at the profile "install" of the io-benchmark
> h2benchw.exe.
> ( aio=threads | SAS-Raid-0 |
> ftp://ftp.heise.de/pub/ct/ctsi/h2benchw.zip | hwbenchw.exe -p -w
> iotest 0)
> The same test but with two cpus gives results between 27 and 298 MB/s!
>
> Also in real life it's noticeable not only with an benchmark. I use a
> win-vm with two cpu for postscript-ripping and have a performance drop
> due to the bad io.
What's your block device model? virtio or ide?
What does cpu usage look like on guest or host?
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2010-05-20 6:13 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-12 21:24 [PATCH 00/12] [PULL] qemu-kvm.git uq/master queue Marcelo Tosatti
2010-05-12 21:24 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:24 ` [PATCH 01/12] Fix -mem-path with hugetlbfs Marcelo Tosatti
2010-05-12 21:24 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:24 ` [PATCH 02/12] kvm: set cpu_single_env around KVM_RUN ioctl Marcelo Tosatti
2010-05-12 21:24 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:24 ` [PATCH 03/12] make SIG_IPI to tcg vcpu thread reliable Marcelo Tosatti
2010-05-12 21:24 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:24 ` [PATCH 04/12] standardize on qemu_cpu_kick for signalling cpu thread(s) Marcelo Tosatti
2010-05-12 21:24 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:24 ` [PATCH 05/12] port qemu-kvm's on_vcpu code Marcelo Tosatti
2010-05-12 21:24 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:25 ` [PATCH 06/12] kvm: synchronize state from cpu context Marcelo Tosatti
2010-05-12 21:25 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:25 ` [PATCH 07/12] add cpu_is_stopped helper Marcelo Tosatti
2010-05-12 21:25 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:25 ` [PATCH 08/12] move stop/stopped CPU_COMMON fields after area zeroed by reset Marcelo Tosatti
2010-05-12 21:25 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:25 ` [PATCH 09/12] kvm: validate context for kvm cpu get/put operations Marcelo Tosatti
2010-05-12 21:25 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:25 ` [PATCH 10/12] kvm: enable smp > 1 Marcelo Tosatti
2010-05-12 21:25 ` [Qemu-devel] " Marcelo Tosatti
2010-05-14 14:06 ` Alexander Graf
2010-05-14 14:06 ` [Qemu-devel] " Alexander Graf
2010-05-14 15:48 ` Avi Kivity
2010-05-14 15:48 ` [Qemu-devel] " Avi Kivity
2010-05-14 15:49 ` Alexander Graf
2010-05-14 15:49 ` [Qemu-devel] " Alexander Graf
2010-05-14 15:54 ` Jan Kiszka
2010-05-14 15:54 ` [Qemu-devel] " Jan Kiszka
2010-05-14 15:58 ` Alexander Graf
2010-05-14 15:58 ` [Qemu-devel] " Alexander Graf
2010-05-19 9:57 ` Udo Lembke
2010-05-19 9:57 ` [Qemu-devel] " Udo Lembke
2010-05-19 16:21 ` Avi Kivity
2010-05-19 16:21 ` [Qemu-devel] " Avi Kivity
2010-05-19 20:02 ` Udo Lembke
2010-05-19 20:02 ` [Qemu-devel] " Udo Lembke
2010-05-20 6:12 ` Avi Kivity [this message]
2010-05-20 6:12 ` Avi Kivity
2010-05-20 7:01 ` Udo Lembke
2010-05-20 7:01 ` [Qemu-devel] " Udo Lembke
2010-05-12 21:25 ` [PATCH 11/12] Do not stop VM if emulation failed in userspace Marcelo Tosatti
2010-05-12 21:25 ` [Qemu-devel] " Marcelo Tosatti
2010-05-12 21:25 ` [PATCH 12/12] kvm: fix 80000001.EDX supported bit filtering Marcelo Tosatti
2010-05-12 21:25 ` [Qemu-devel] " Marcelo Tosatti
2010-05-17 18:10 ` [Qemu-devel] [PATCH 00/12] [PULL] qemu-kvm.git uq/master queue Anthony Liguori
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