linux-kernel - Re: [ANNOUNCE] Native Linux KVM tool v2

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Message-ID: <4DF9271E.2060701@codemonkey.ws>
Date:	Wed, 15 Jun 2011 16:41:50 -0500
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	Pekka Enberg <penberg@...nel.org>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Avi Kivity <avi@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Prasad Joshi <prasadjoshi124@...il.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Asias He <asias.hejun@...il.com>
Subject: Re: [ANNOUNCE] Native Linux KVM tool v2

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@...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
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