Re: performance degraded 2.4.8 -> 2.4.9?

[Stephen Lord <lord@xxxxxxx>]

Dan Yocum wrote:

> Tommy Wu wrote:
>
> > Dan Yocum <yocum@xxxxxxxx> wrote:
> >
> > > What happened between 2.4.8 and 2.4.9 that the disk I/O performance would
> > > *dramatically* drop?  With 2.4.8 I'm getting ~34MB/s writes and ~160MB/s
> > > reads.  As of 2.4.9 this has dropped to ~10MB/s writes and 80-100MB/s
> > > reads.  That's pretty bad.  The problem was not fixed with 2.4.10 and is
> > > still the same as of 2.4.13pre6 - I haven't checked the latest in a couple
> > > weeks, maybe it's better?
> > >
> > > I've decided to drop back to 2.4.5 since 2.4.8 was regularly crashing the
> > > machines, the "kernel: __alloc_pages: 3-order allocation failed." errors
> > > seem to have gone away, and the performance is right up there.
> >   I've got the same problem in 2.4.8, 2.4.9, 2.4.10...  and plus a
> >   xfs_force_shutdown problem in 2.4.9 in last month....
> >
> >   I change my kernel to 2.4.8mdk from mandrank (base on -ac)... last month.
> >   It work great for me now! Running on a P3 1G SMP system with 1G ram
> >   for Oracle 9i.
>
> I don't suppose you could take the system offline long enough to run a
> bonnie++ test on it, could you?
>
> Dan
I have been fighting Irix code for the last few weeks to meet some 
deadlines, and
I am about to go on vacation until after thanksgiving. Hopefully I will 
get some time
to look at this after I come back.

Steve