Re: Terrible performance on U3 x86_64 kernel

[Jason Baron <jbaron redhat com>]

On Fri, 17 Mar 2006, Aleksandar Milivojevic wrote:

> Milan Keraláger wrote:
> > Hi,
> > 
> > I went into the terrible performance hit when rebooted to U3 kernel. I
> > had to go back to 2.6.9-27.ELsmp (my previous kernel) and everything
> > seems to be ok again.
> > 
> > The reboot took a lot of time with U3 kernel. I tryed 'ls' in root's
> > home directory and it took about 2-5 sec even repeated run :-( The
> > server run U3 kernel for 24 hour or so when the problem arised.
> > 
> > Seems like odd FS issue or so... Anybody other saw similar problem?
> 
> I've several boxes with new kernel (some rather busy), and all seems to be
> fine.  Could be some device driver problem (you haven't mentioned what
> hardware components you have).  You'd be probably best of contacting support
> and/or filing entry on bugzilla.
> 

that would be a good place to start. there weren't that many changes 
between -27 and -34, so if there is a real problem we should be able to 
narrow it down pretty quickly. Anything in suspicious in 
/var/log/messages? An 'lsmod' and an 'alt-sysrq-t' when the system hangs 
might go a long way too, but file a bug so we can track this.

thanks.