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

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Message-ID: <BANLkTikmUpF_fsZcpiuMzZQZa17U-cPQAw@mail.gmail.com>
Date:	Thu, 16 Jun 2011 08:41:55 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	Alexander Graf <agraf@...e.de>,
	Prasad Joshi <prasadjoshi124@...il.com>,
	Avi Kivity <avi@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Asias He <asias.hejun@...il.com>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [ANNOUNCE] Native Linux KVM tool v2

On Thu, Jun 16, 2011 at 1:44 AM, Anthony Liguori <anthony@...emonkey.ws> wrote:
>> That's probably why it's fast, it doesn't preserve data integrity :(
>
> Actually, I misread the code.  It does unstable writes but it does do
> fsync() on FLUSH.

Yes. That's fine, right? Or did we misread how virtio block devices
are supposed to work?

Btw, unstable writes doesn't really explain why *read* performance is better.

                            Pekka
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