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Date: Wed, 15 Jun 2011 16:41:50 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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To: Pekka Enberg <penberg@kernel.org>
CC: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        Avi Kivity <avi@redhat.com>, Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@elte.hu>, Prasad Joshi <prasadjoshi124@gmail.com>,
        Sasha Levin <levinsasha928@gmail.com>,
        Cyrill Gorcunov <gorcunov@gmail.com>, Asias He <asias.hejun@gmail.com>
Subject: Re: [ANNOUNCE] Native Linux KVM tool v2
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On 06/15/2011 10:53 AM, Pekka Enberg wrote:
> Hi all,
>
> We’re proud to announce the second version of the Native Linux KVM tool! We’re
> now officially aiming for merging to mainline in 3.1.
>
> Highlights:
>
> - Experimental GUI support using SDL and VNC
>
> - SMP support. tools/kvm/ now has a highly scalable, largely lockless driver
>    interface and the individual drivers are using finegrained locks.
>
> - TAP-based virtio networking
>
> - Fast QCOW2 image read-write support beating Qemu in fio benchmarks. See the
>    following URL for test result details: https://gist.github.com/1026888

What was the commit hash for the QEMU you tested?

The following caused a major regression in qcow2:


commit a16c53b101a9897b0b2be96a1bb3bde7c04380f2
Author: Anthony Liguori <aliguori@us.ibm.com>
Date:   Mon Jun 6 08:25:06 2011 -0500

     Fix regression introduced by -machine accel=

     Commit 85097db6 changed the timing when kvm_allowed is set until after
     kvm is initialized.  During initialization, the ioeventfd 
initialization cod
     checks kvm_enabled() and after this change, ioeventfd is 
effectively disable

If it's not in your tree, it would be useful to rerun the test with the 
latest git.

Regards,

Anthony Liguori