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Re: [Xen-users] Severe dom0 performance issues after installing Xen

...not shure what's going on there, but would try following things:

- try to boot with kernel options noapic
- try to pin one CPU directly to Dom0 and set max cpu to 1 on Dom0 (xen and 
kernel options)
- try to boot with disabled acpi etc.
- try to find out "what" is slow, i.e. I/O, CPU, net etc and what not

Is there any "point" to recognize during boot when the system "got slow"?

Best regards,


"Raj Mathur (ààà ààààà)" <raju@xxxxxxxxxxxxxxx> schrieb:

>On Tuesday 04 Sep 2012, Keith Buck wrote:
>> I'm experiencing some severe performance issues running Xen 4.0.1
>> with a cleanly-installed Debian 6 dom0.  Prior to installation, the
>> machine's performance was fine, but after installation booting takes
>> anywhere from 5 to 20 times longer, processes take a long time to
>> start, and SSH lags.  No domUs are running (or have been created
>> yet).  I can switch back to running without Xen (but still using the
>> Xen-compatible kernel) and the performance problems disappear.
>Probably a stupid question, but sometime we miss the obvious: did you 
>make any networking changes?  Specifically, could this problem be due
>not being able to reverse resolve IP addresses on your machine?
>-- Raj
>Raj Mathur                          || raju@xxxxxxxxxxxxx   || GPG:
>http://otheronepercent.blogspot.com || http://kandalaya.org || CC68
>It is the mind that moves           || http://schizoid.in   || D17F

Niels Dettenbach
Syndicat IT&Internet

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