[Gllug] Virtual disk allocation advice requested

[Kostas Georgiou]

On Thu, Jul 03, 2008 at 10:24:13AM +0100, Richard Jones wrote:

> Something like the above, I may have missed out or exaggerated some
> context switches, but I think that single request/response turns into
> on the order of 6 context switches.  The situation is much worse if
> you're not paravirtualizing.
> 
> In practice this is noticably slow.  NFS over UDP was unusable when I
> tried it, and NFS(v3) over TCP is usable but slow.

Interesting, at home I have a paravirtualized domU mounting home
directories with NFS(v4+sec=krb5) from dom0 and while I haven't bothered
with any real benchmarks performance seems exactly the same as accessing
the disks locally, i.e. dd gets around 50MB/sec for reads/writes and for
interactive performance you can't tell any difference.   

Kostas
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