Re: [Xen-users] io scheduler

[Matt Ayres <matta@xxxxxxxxxxxx>]

Gerd,

Just an FYI I'm tracking -unstable these days due to problems with xend 
hanging with too many requests to it... side note, because of this I'm 
using the CFQ scheduler and no more complaints from users regarding I/O 
wait and no panics related to CFQ (actually no panics at all, now we 
just need to ditch xend!).
Gerd Hoffmann wrote:
> Anand wrote:
>
> > Just had a thought, since those changes are in the kernel files it,
> > can't we just compile the kernel off the unstable and then use that for
> > domU. This way disk io features would be available to in any version.
> No, it's in the backend driver, thus you have to replace the dom0
> kernel.  No protocol changes, so you can just drop-in the new kernel and
> everything should work.
>
> > However can any developer or someone can confirm if this is ok ? And how
> > do we verify if the IO scheduler working ? from the host ? inside dom U ?
> With the new dom0 kernel you'll have one kernel thread per virtual block
> device.  This helps the I/O scheduler (which uses the PID to decide how
> to group/queue requests) to do a better job.  It also allows you to
> tweak the priorities using ionice (comes with recent util-linux versions).
>
> cheers,
>
>   Gerd
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