RE: [Xen-users] Asynchronous IO

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> 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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