From: Paolo Bonzini <pbonzini@redhat.com>
To: Martin Mailand <martin@tuxadero.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
reeted@shiftmail.org, qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: virtio-blk performance regression and qemu-kvm
Date: Wed, 07 Mar 2012 12:21:45 +0100 [thread overview]
Message-ID: <4F5744C9.8010308@redhat.com> (raw)
In-Reply-To: <4F573AFE.40204@tuxadero.com>
Il 07/03/2012 11:39, Martin Mailand ha scritto:
> The host disk can at max. 13K iops, in qemu I get at max 6,5K iops,
> that's around about 50% overhead. All the test were with 4k reads, so I
> think we are mostly latency bound.
For latency tests, running without ioeventfd could give slightly better
results (-global virtio-blk-pci.ioeventfd=off).
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Martin Mailand <martin@tuxadero.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
reeted@shiftmail.org, qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm
Date: Wed, 07 Mar 2012 12:21:45 +0100 [thread overview]
Message-ID: <4F5744C9.8010308@redhat.com> (raw)
In-Reply-To: <4F573AFE.40204@tuxadero.com>
Il 07/03/2012 11:39, Martin Mailand ha scritto:
> The host disk can at max. 13K iops, in qemu I get at max 6,5K iops,
> that's around about 50% overhead. All the test were with 4k reads, so I
> think we are mostly latency bound.
For latency tests, running without ioeventfd could give slightly better
results (-global virtio-blk-pci.ioeventfd=off).
Paolo
next prev parent reply other threads:[~2012-03-07 11:21 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-10 14:36 virtio-blk performance regression and qemu-kvm Dongsu Park
2012-02-10 14:36 ` [Qemu-devel] " Dongsu Park
2012-02-12 23:55 ` Rusty Russell
2012-02-12 23:55 ` [Qemu-devel] " Rusty Russell
2012-02-21 16:45 ` Dongsu Park
2012-02-21 16:45 ` [Qemu-devel] " Dongsu Park
2012-02-21 22:16 ` Rusty Russell
2012-02-21 22:16 ` [Qemu-devel] " Rusty Russell
2012-02-13 11:57 ` Stefan Hajnoczi
2012-02-13 11:57 ` [Qemu-devel] " Stefan Hajnoczi
2012-02-21 15:57 ` Dongsu Park
2012-02-21 15:57 ` [Qemu-devel] " Dongsu Park
2012-02-21 17:27 ` Stefan Hajnoczi
2012-02-21 17:27 ` [Qemu-devel] " Stefan Hajnoczi
2012-02-22 16:48 ` Dongsu Park
2012-02-22 16:48 ` [Qemu-devel] " Dongsu Park
2012-02-22 19:53 ` Stefan Hajnoczi
2012-02-22 19:53 ` [Qemu-devel] " Stefan Hajnoczi
2012-02-28 16:39 ` Martin Mailand
2012-02-28 16:39 ` [Qemu-devel] " Martin Mailand
2012-02-28 17:05 ` Stefan Hajnoczi
2012-02-28 17:05 ` [Qemu-devel] " Stefan Hajnoczi
2012-02-28 17:15 ` Martin Mailand
2012-02-28 17:15 ` [Qemu-devel] " Martin Mailand
2012-02-29 8:38 ` Stefan Hajnoczi
2012-02-29 8:38 ` [Qemu-devel] " Stefan Hajnoczi
2012-02-29 13:12 ` Martin Mailand
2012-02-29 13:12 ` [Qemu-devel] " Martin Mailand
2012-02-29 13:44 ` Stefan Hajnoczi
2012-02-29 13:44 ` [Qemu-devel] " Stefan Hajnoczi
2012-02-29 13:52 ` Stefan Hajnoczi
2012-02-29 13:52 ` [Qemu-devel] " Stefan Hajnoczi
2012-03-05 16:13 ` Martin Mailand
2012-03-05 16:13 ` [Qemu-devel] " Martin Mailand
2012-03-05 16:35 ` Stefan Hajnoczi
2012-03-05 16:35 ` [Qemu-devel] " Stefan Hajnoczi
2012-03-05 16:44 ` Martin Mailand
2012-03-05 16:44 ` [Qemu-devel] " Martin Mailand
2012-03-06 12:59 ` Stefan Hajnoczi
2012-03-06 12:59 ` [Qemu-devel] " Stefan Hajnoczi
2012-03-06 22:07 ` Reeted
2012-03-06 22:07 ` Reeted
2012-03-07 8:04 ` Stefan Hajnoczi
2012-03-07 14:21 ` Reeted
2012-03-07 14:33 ` Stefan Hajnoczi
2012-03-07 14:33 ` Stefan Hajnoczi
2012-03-07 10:39 ` Martin Mailand
2012-03-07 10:39 ` [Qemu-devel] " Martin Mailand
2012-03-07 11:21 ` Paolo Bonzini [this message]
2012-03-07 11:21 ` Paolo Bonzini
2012-03-06 14:32 ` Dongsu Park
2012-03-06 14:32 ` [Qemu-devel] " Dongsu Park
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