Re: [Qemu-devel] virtio-blk performance regression and qemu-kvm

[Stefan Hajnoczi]

On Tue, Feb 28, 2012 at 4:39 PM, Martin Mailand <address@hidden> wrote:
> I could reproduce it and I bisected it down to this commit.
>
> 12d4536f7d911b6d87a766ad7300482ea663cea2 is the first bad commit
> commit 12d4536f7d911b6d87a766ad7300482ea663cea2
> Author: Anthony Liguori <address@hidden>
> Date:   Mon Aug 22 08:24:58 2011 -0500

This seems strange to me.

What commit 12d4536f7 did was to switch to a threading model in
*qemu.git* that is similar to what *qemu-kvm.git* has been doing all
along.

That means the qemu-kvm binaries already use the iothread model.  The
only explanation I have is that your bisect went down a qemu.git path
and you therefore tripped over this - but in practice it should not
account for a difference between qemu-kvm 0.14.1 and 1.0.

Can you please confirm that you are bisecting qemu-kvm.git and not qemu.git?

Stefan