Re: Strange latency hvm domU boot xen 4.0.1-rc2-pre and 2.6.32.15 pv_ops

[Fantu <fantonifabio@tiscali.it>]

Config is based on config of debian kernel: 
http://old.nabble.com/file/p28804864/config-2.6.32.15 myconfig 

Pasi Kärkkäinen wrote:
> 
> i no add other debug option, i must remove some option in this?
> and the grub entry:
> title		Xen 4 / Debian GNU/Linux, kernel 2.6.32.15
> root		(hd0,0)
> kernel		/boot/xen.gz dom0_mem=1536M
> module		/boot/vmlinuz-2.6.32.15 root=LABEL=root-raid ro nomodeset
> module		/boot/initrd.img-2.6.32.15
> 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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> 

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