Messages in this thread |  | | Date | Tue, 31 Oct 2000 00:52:11 +1100 | From | Andrew Morton <> | Subject | Re: ide/disk perf? |
| |
Pierre Etchemaite wrote: > > Le 30-Oct-2000, Mohammad A. Haque écrivait : > > Could someone who knows ide and drive inside and out (Andre?) please > > take a look at these figures? Am I forgetting to do something (or doing > > something I'm not suposed to) to get the best numbers? I thought I'd be > > able to get more than ~4MB/sec off the HPT366 and a UDMA66 drive. > > It could be unrelated, but I had problems several times with Maxtor drives > recently; Their performances are usually high (some models give >20 Mb/s > both reads and writes), but under some conditions that I couldn't narrow down > yet, the read throughput is stuck to the floor (a few megabytes/sec) until > next reboot. The write performance is always ok.
I had the same problem with Seagate ST313021A (13 gig) drives on BP6/HPT366/UDMA66. Initial throughput reported by `hdparm -t' was 22 megs/sec which would slowly wilt to 5 megs/sec.
I discovered that sending _any_ reconfiguration command to the drive - even one which was not supported by that particular drive - would bring the performance back.
So when it goes slow, try running, say, `hdparm -A1' and see what happens.
Andre and I scratched each others heads for a while, suspected a firmware bug. He sent an email to a contact at Seagate. This was in April, so I guess that person is a very slow typist. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |