Re: [Xen-devel] Strange latency hvm domU boot xen 4.0.1-rc2-pre and 2.6.32.15 pv_ops

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Jun 04, 2010 at 02:27:55PM -0700, Fantu wrote:
> 
> Dom0:
> pvops 2.6.32.15 (last commit of xen/stable2.6.32.x)
> xen 4.0 hg-testing (changeset 21188)
> 13 windows pv guest (all xp pro sp3 with gplpv 0.11.0.213), disk with
> tap2:aio
> dom0 RAM fixed to 1GB and balloning off
> 
> we noticed a very impressive speed starting up the first 6-7 windows domU.
> after this very high loading speed, starting the remaining domains always
> lead to
> an gradual performance loss.
> activity on phisical disk seems to be less and less) and the remaining
> domains
> are loaded at very low speed respect to the former.
> after a relative long time (2-6 minutes) and some of the latest domains were
> loaded
> and started, the remaining 1-2 domains seems to load at normal (high) speed
> again.
> 
> is no problem of start specific domU
> before update kernel and xen to last commit the problem was more
> 
> save, restore and shutdown of all 13 domU are very fast, problem is only on
> start...already reapeat all test some times
> 
> no logs in syslog nor in kernel.log neither in xend.log are printed out,
> even with
> maximum level of verbosity.
> 
> any help appreciated here
>

Have you checked your dom0 kernel .config for various DEBUG options? 

Some people reported performance problems earlier and it turned out they
had some (extra) debugging options turned on..

Worth checking.

-- Pasi


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