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SubjectRe: Strange IDE performance observations
On Sat, Mar 18, 2000 at 12:57:54AM -0800, Andre Hedrick wrote:
> Move to
>
> linux-2.2.14 + pre-patch-2.2.15-15 + ide.2.2.15-15.20000317.patch.bz2

Ok. Tried it. Same results:


/dev/hda:
Timing buffered disk reads: 64 MB in 8.50 seconds = 7.53 MB/sec

/dev/hdb:
Timing buffered disk reads: 64 MB in 6.31 seconds = 10.14 MB/sec

/dev/hdc:
Timing buffered disk reads: 64 MB in 7.39 seconds = 8.66 MB/sec

/dev/hdd:
Timing buffered disk reads: 64 MB in 9.50 seconds = 6.74 MB/sec


> Are you setting:
>
> CONFIG_BLK_DEV_IDEPCI=y
> CONFIG_BLK_DEV_IDEDMA=y
> CONFIG_IDEDMA_AUTO=y
> CONFIG_BLK_DEV_PIIX=y
> CONFIG_BLK_DEV_PIIX_TUNING=y

Just verified (I'm assuming you did mean CONFIG_PIIX_TUNING since that is
what is everywhere EXCEPT in Configure.help, where it does have
CONFIG_BLK_DEV_PIIX_TUNING).

> If you have not set these options, the kernel can not correctly setup
> transfer rates. If you have done the above, then I need to go to Maxtor.

Well, I do have those set up. However, don't forget, I was getting regular
DMA errors with hdd. Course, now I'm not seeing them with 2.2.15pre15
using my usual stress test of du -s on one of the partitions. Hmmm...

Also, someone mentioned to me offlist that the 430VX is, well, a piece of
shit. If it's just a crappy motherboard, I'm happy with that. Or if it's
maybe just this harddrive acting up, I can live with that, too. I just
wish I knew how to verify that it's either of those two situations as
opposed to something wrong in the kernel. Alas, I don't have a duplicate
system to test on, though.

mrc
--
Mike Castle Life is like a clock: You can work constantly
dalgoda@ix.netcom.com and be right all the time, or not work at all
www.netcom.com/~dalgoda/ and be right at least twice a day. -- mrc
We are all of us living in the shadow of Manhattan. -- Watchmen

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