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Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm
From: |
Dongsu Park |
Subject: |
Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm |
Date: |
Tue, 21 Feb 2012 17:45:08 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Hi Rusty,
On 13.02.2012 10:25, Rusty Russell wrote:
> On Fri, 10 Feb 2012 15:36:39 +0100, Dongsu Park <address@hidden> wrote:
> > Hi,
> >
> > Recently I observed performance regression regarding virtio-blk,
> > especially different IO bandwidths between qemu-kvm 0.14.1 and 1.0.
> > So I want to share the benchmark results, and ask you what the reason
> > would be.
>
> Interesting. There are two obvious possibilities here. One is that
> qemu has regressed, the other is that virtio_blk has regressed; the new
> qemu may negotiate new features. Please do the following in the guest
> with old and new qemus:
>
> cat /sys/class/block/vdb/device/features
>
> (eg, here that gives: 0010101101100000000000000000100e0).
I did that on guest VM, using both qemu-kvm 0.14.1 and 1.0.
(cat /sys/class/block/vdb/device/features)
using qemu-kvm 0.14.1:
0010101101100000000000000000100000000000000000000000000000000000
using qemu-kvm 1.0:
0010101101100000000000000000110000000000000000000000000000000000
>From my understanding, both of them have the same virtio features.
Please correct me if I'm wrong.
Regards,
Dongsu
- [Qemu-devel] virtio-blk performance regression and qemu-kvm, Dongsu Park, 2012/02/10
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Rusty Russell, 2012/02/12
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm,
Dongsu Park <=
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Stefan Hajnoczi, 2012/02/13
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Dongsu Park, 2012/02/21
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Stefan Hajnoczi, 2012/02/21
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Dongsu Park, 2012/02/22
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Stefan Hajnoczi, 2012/02/22
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Martin Mailand, 2012/02/28
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Stefan Hajnoczi, 2012/02/28
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Martin Mailand, 2012/02/28
- Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm, Stefan Hajnoczi, 2012/02/29