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/
This archive was generated by hypermail 2b29 : Tue Oct 31 2000 - 21:00:26 EST