Messages in this thread | | | Date | Tue, 11 Dec 2001 09:20:52 -0800 | From | "H . J . Lu" <> | Subject | Re: Slow Disk I/O with QPS M3 80GB HD |
| |
On Tue, Dec 11, 2001 at 12:05:06PM -0500, Ben Collins wrote: > 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?
I don't think the 1394 driver is the problem. I have tried the 1394 driver from a good kernel. I got the same result.
H.J. - 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/
| |