Re: Xen issues - Was Xen network performance problem during kickstart.

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'Ello,

On Mon, 2006-02-20 at 08:41 -0500, Stephen C. Tweedie wrote:
> >     ------------[ cut here ]------------
> > kernel BUG at include/asm/xor.h:633!
> > invalid opcode: 0000 [#1]
> 
> That was supposed to be fixed (bug 177644); I'll chase this up and see
> what's happening here.

Cheers, just tried as of a few minutes ago and it's still with me..

kernel BUG at include/asm/xor.h:633!
invalid opcode: 0000 [#1]
SMP
Modules linked in: xor raid1 raid0 xennet sr_mod sd_mod scsi_mod cdrom
squashfs loop nfs nfs_acl lockd sunrpc vfat fat cramfs
CPU:    0

After install was done there were also a few errors on start up
(something about /dev/map ).


> > 2) Ridiculously slow : 4 hours for a guest install of ‾500mb. No
> > identifiable host problem.  I'm trying to do a network install and the
> > instance running right now is doing less than 1 byte/sec according to
> > "xm top".

Just had it complete an install in an hour. Which is better.  Ran some
tests.

wget over local net ( layer 2 switched no routing hops ) of
openoffice-core RPM (77MB) :

100%[====================================>] 80,504,759     1.52M/s
ETA 00:00 

932.47 KB/s

The same test from domain-0 :

100%[=================================================================================================================>] 80,504,759    10.03M/s    ETA 00:00

10.40 MB/s.

That's a very big difference. Normally I'd say it was duplex problem but
I can't check that because of this :

[root@localhost ~]# ethtool eth0
Settings for eth0:
No data available



> 
> > 3) Install crashes out at random points into install :
> > > > Traceback (most recent call last):                               File
> > > > "/usr/bin/anaconda", line 1210, in ?
> > > > 
> > > > handleException(dispatch, intf, sys.exc_info())
> ...
> > > > return _snack.reflow(text, width, flexDown, flexUp)
> > > > 
> > > > TypeError: argument 1 must be string without null bytes, not str
> > > >                                                        install exited
> > > > abnormally
> 
> Looks like an anaconda bug; could you file a bug report, please?

Sure, will try and reproduce.  You know, I think it happened last week
with two guest installs at the same time.  Will check.

Cheers,

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