[Xen-users] Serious performance problems - is Xen not ready for production use?

[Patrick Hess <posi@xxxxxxx>]

Hi,

I hope my current problems with Xen 2.0.5 are related to my own 
stupidity - otherwise I'm getting the impression that Xen is not ready 
for productional use at the current stage.
I tried to migrate a dedicated web/mailserver to a Xen machine 
yesterday. The original server is a Celeron 2Ghz with 256MB, the new 
machine running Xen is an Athlon 2400 with 512M. So I created a domU 
with 256M memory, made a copy of the old system, adjusted fstab, 
networking and started it up. OS is a debian woody.
Everything seems to work - all services are there and working so the 
system itself is working ok. But: when accessing resources like squirrel 
webmail or accessing the IMAP service the machine is very slow (compared 
to old setup). The load average climbs easily to values above 6, 12 was
the highest value that I got when playing with a single client. Old 
system was never used in a way that a lot CPU power was needed, load avg 
stays there normally below 0.05-0.1 -- on the Xen setup the load never 
dropped below 2.5 (!!).
If anyone has an idea what causes this and how to fix it I would be 
really happy because currently I see no way migrating the server to the 
Xen-based system.
Together with the still unsolved question about ballooning the memory 
this caused my impression that I shouldn't use Xen in production 
environment (see also my message from 06/28/2005 03:47 'Can't increase 
memory size during runtime' or 'problem to balloon memory beyond initial 
allocation' from Xuehai Zhang (07/07/2005 06:30). This is really sad 
because I really like Xen and WOULD like to use it...
No, /lib/tls is not there ;)



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