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RE: [Xen-users] Asynchronous IO

from [Ian Pratt]

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To:	"Priya PM" <pmpriya@xxxxxxxxx>, <Xen-users@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-users] Asynchronous IO
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Thu, 8 Sep 2005 10:17:07 +0100
Cc:	ian.pratt@xxxxxxxxxxxx
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Thread-topic:	[Xen-users] Asynchronous IO

> I have installed Xen on Linux 2.6.11.10 and i am trying to do 
> Asynchronous Direct IO on SAS drives. The application which 
> does the asynchronous direct io on SAS drive is running on 
> Domain 0. Actually the IOPs what i get for a 512Bytes IO size 
> is 67, but if i do the same operation on Linux 2.6.11.10 
> native kernel, i get 267 IOPs.Can anyone tell me why this 
> huge differnece? Am i missing something? In the current setup 
> on Xen, if i do Synchronous IO, then i am getting 265 IOPs 
> which is expected. So i am wondering why Asynchronous IO 
> should behave this way? Is there any reason?? 

That's odd. You might want to try the -unstable tree. I know Andy has
used AIO just fine on -unstable.

Ian

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