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Message-ID: <20090401204039.GR18394@sequoia.sous-sol.org>
Date: Wed, 1 Apr 2009 13:40:39 -0700
From: Chris Wright <chrisw@...s-sol.org>
To: Anthony Liguori <anthony@...emonkey.ws>
Cc: Andi Kleen <andi@...stfloor.org>,
Gregory Haskins <ghaskins@...ell.com>,
linux-kernel@...r.kernel.org, agraf@...e.de, pmullaney@...ell.com,
pmorreale@...ell.com, rusty@...tcorp.com.au,
netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC PATCH 00/17] virtual-bus
* Anthony Liguori (anthony@...emonkey.ws) wrote:
> Andi Kleen wrote:
>> On Wed, Apr 01, 2009 at 10:19:49AM -0400, Gregory Haskins wrote:
>>> Performance. We are trying to create a high performance IO infrastructure.
>>
>> Ok. So the goal is to bypass user space qemu completely for better
>> performance. Can you please put this into the initial patch
>> description?
>
> FWIW, there's nothing that prevents in-kernel back ends with virtio so
> vbus certainly isn't required for in-kernel backends.
Indeed.
> That said, I don't think we're bound today by the fact that we're in
> userspace. Rather we're bound by the interfaces we have between the
> host kernel and userspace to generate IO. I'd rather fix those
> interfaces than put more stuff in the kernel.
And more stuff in the kernel can come at the potential cost of weakening
protection/isolation.
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