Re: slow guest performance with build load, looking for ideas

[Erik Jacobson <erikj@sgi.com>]

> Haven't followed the thread in great detail, but has anyone tried
> putting the virtio disk back into rotational mode?

Thanks Mark.

I have not tried this yet.

To be honest, I wasn't fully understanding some of Avi's last comments and
was waiting for one of my co-workers to be available to help me parse them.

I plan to perform Avi's suggestions, plus this rotational idea, early next
week.  I'll update the BZs too.

By the way, a request to work-order a system for a few weeks to play with this
stuff was approved.  This means I'll have easier access to a nicely configured 
multi-socket Nehalem system for a while, starting perhaps a week or two from
now.  At this moment, I have to beg for time slices.

Even before I get temporary access to that box, I'm happy to run tests
for people who don't have access to this hardware right now.  I'll have to be
a go-between though as my idea to put it outside the firewall didn't quite
work out.  Really, I'm looking to encourage scalability here that will
help big NUMA systems do virtualization well.  I'm not a big kernel hacker
like Jes (I just dabble) but hopefully I can find my own way to contribute.

Thanks again.

> 
> See also:
> 
>   https://bugzilla.redhat.com/509383
> 
> and:
> 
>   http://lkml.org/lkml/2008/10/27/84
> 
> Cheers,
> Mark.
> 
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-- 
Erik Jacobson - Linux System Software - SGI - Eagan, Minnesota