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

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

[Fantu]

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

[Pasi Kärkkäinen]

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

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

[Fantu]

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
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
> 
> 

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