Messages in this thread |  | | | Date | Tue, 11 Dec 2001 11:05:07 -0500 | | From | Ben Collins <> | | Subject | Re: Slow Disk I/O with QPS M3 80GB HD |
| |
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/
|  |