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Re: [Xen-devel] poor domU VBD performance.

from [Kurt Garloff] [Permanent Link][Original]
To: Philip R Auld <pauld@xxxxxxxxxxx>
Subject: Re: [Xen-devel] poor domU VBD performance.
From: Kurt Garloff <garloff@xxxxxxx>
Date: Thu, 31 Mar 2005 17:34:49 +0200
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, Xen development list <xen-devel@xxxxxxxxxxxxxxxxxxx>, Vincent Hanquez <tab@xxxxxxxxx>, Jens Axboe <axboe@xxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
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Hi,

On Thu, Mar 31, 2005 at 09:33:12AM -0500, Philip R Auld wrote:
> This effects merging though, right? I don't think the the front
> end has done any merging. 

The noop elevator does front and back merging.
My understanding is that it's used in the frontend driver.

Otherwise, unplugging on every block would indeed be quite bad ...

Regards,
-- 
Kurt Garloff, Director SUSE Labs, Novell Inc.

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