On Mon, Dec 10, 2001 at 11:57:08PM -0800, H . J . Lu wrote:
> On Mon, Dec 10, 2001 at 08:34:52PM -0800, H . J . Lu wrote:
> > I have a very strange problem. The disk I/O of my QPS M3 80GB HD is
> > very slow under 2.4.10 and above. I got like 1.77 MB/s from hdparm.
> > But under 2.4.9, I got 14 MB/s on the same hardware. A 30GB HD has
> > consistent I/O performance under 2.4.9 and above on the same bus. Has
> > anyone else seen this? Does anyone have a large (>= 80GB) 1394 HD?
> >
>
> I did a binary search. 2.4.10-pre10 is the last good kernel. I got
>
> # hdparm -t /dev/sda
>
> /dev/sda:
> Timing buffered disk reads: 64 MB in 4.40 seconds = 14.55 MB/sec
Have you checked the way that your ohci and sbp2 devices are detected
under each case? Most notably the max packet size.
Ben
-- .----------=======-=-======-=========-----------=====------------=-=-----. / Ben Collins -- Debian GNU/Linux \ ` bcollins@debian.org -- bcollins@openldap.org -- bcollins@linux.com ' `---=========------=======-------------=-=-----=-===-======-------=--=---' - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:20 EST