On Tue, Dec 11, 2001 at 08:45:52AM -0800, H . J . Lu wrote:
> On Tue, Dec 11, 2001 at 11:05:07AM -0500, Ben Collins wrote:
> > 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.
> >
>
> They all say
>
> ohci1394_0: OHCI-1394 1.0 (PCI): IRQ=[19] MMIO=[f8ffd000-f8ffe000] Max Packet=[1024]
> ieee1394: sbp2: SBP-2 device max speed S200 and payload 1KB
Have you tried linux1394 CVS with a 2.4.10pre10 kernel to narrow down
where the slowdown has occured?
-- .----------=======-=-======-=========-----------=====------------=-=-----. / 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/
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