Austin Gonyou wrote:
> I don't know if you can, but I'd suggest using either 2.4.14 or 2.4.15
> when it's ready since the loopback bug will be fixed in that version.
Hm? I guess I missed that one - got a link to a message on l-k that
'splains it - I don't see anything in the XFS mailing list archives.
I should note, I don't think the problem is with XFS since I see the same
performance degradation using 'dd' to the raw device, too. But, I know you
guys touch the kernel code all over the place so maybe something...
> On Tue, 2001-11-13 at 17:04, Dan Yocum wrote:
> > Hi all,
> > 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.
> > Cheers,
> > Dan
> > --
> > Dan Yocum
> > Sloan Digital Sky Survey, Fermilab 630.840.6509
> > yocum@xxxxxxxx, http://www.sdss.org
> > SDSS. Mapping the Universe.
> Austin Gonyou
> Systems Architect, CCNA
> Coremetrics, Inc.
> Phone: 512-796-9023
> email: austin@xxxxxxxxxxxxxxx
Sloan Digital Sky Survey, Fermilab 630.840.6509
SDSS. Mapping the Universe.