Re: [Xen-users] Fedora Core 4 - development "Domain 0 allocation is too small for kernel image"

["Randy Macleod" <macleodr@xxxxxxxxxx>]

Timo Virtaneva wrote:
> Hi
>
> The 2.6.13 build is broken and it won't work. It is described in Redhat 
> bugzilla.
>
> Eithet you use the 2.6.11 or download working version from 
> http://people.redhat.com/riel/xen_for_fc4/
  Thanks for the tip. I too used the rpms listed above
and got Xen to boot the RH FC4 distro
(networking didn't work though...)

Performance was disappointing.

This statement is based on
interactive desktop behaviour: startup, firefox, etc..
It was easy to run glxgears as a quick test so see below.

I'm a bit concerned because alot of the interest in Xen is
due to the claims like:
<quote>
Linux's performance is consistently close to native Linux,
the worst case being OSDB-IR, which experiences an 8% slowdown.
</quote>
(http://www.cl.cam.ac.uk/Research/SRG/netos/xen/performance.html)

So do other people see similar performance?
Am I doing something wrong/silly?
Is it reasonable to expect better interactive performance
for dom0?

Performance seemed so bad that I didn't bother to configure and
start a domU... not a good first impression.

Thanks,
// Randy


$ /sbin/lspci
00:00.0 Host bridge:
  Intel Corporation 82865G/PE/P DRAM Controller/Host-Hub Interface (rev 02)

$ cat /proc/cpuinfo | grep name
model name      : Intel(R) Pentium(R) 4 CPU 2.80GHz

$ free
Mem:       2067580     226208    1841372          0      17004     101524

The dom0 instance had > 1 G ram....




native 2.6.14-1.1656_FC4

[neptune@pcard0gb ~]$ glxgears
5504 frames in 5.0 seconds = 1100.800 FPS
5498 frames in 5.0 seconds = 1099.600 FPS
5505 frames in 5.0 seconds = 1101.000 FPS


mv /lib/tls /lib/tls.disabled
reboot 2.6.14-1.1656_FC4
[neptune@pcard0gb ~]$ glxgears
5462 frames in 5.0 seconds = 1092.400 FPS
5461 frames in 5.0 seconds = 1092.200 FPS

[neptune@pcard0gb ~]$ uname -r
2.6.12-1.1454_FC4xen0
[neptune@pcard0gb ~]$ glxgears
1312 frames in 5.0 seconds = 262.400 FPS
1296 frames in 5.0 seconds = 259.200 FPS

That's alot slower...

--
// Randy MacLeod
macleodr@xxxxxxxxxx  |   Not Nortel's Opinions.
---------------------X-----------------------------
Nortel, Ottawa, ON  / \

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