Re: 2.4.20-pre2-ac4 IDE is slow

[Athanasius]

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On Thu, Aug 22, 2002 at 01:59:45PM -0400, Rob Speer wrote:
> I'm going from 2.4.19 to 2.4.20-pre2-ac4 and the hard drive is noticably
> slower in the new version. (It doesn't use DMA in either version - I
> wish it did in ac4, but that's a separate problem.)
>=20
> What I seem to remember from the other message is that there's some
> parameter that can be changed to bring the speed back up. Could someone
> tell me what it is?
>=20
>=20
> If it helps: output of hdparm /dev/hda
>=20
> /dev/hda:
>  multcount    =3D  0 (off)
>  IO_support   =3D  0 (default 16-bit)

  This could be part of the problem too?  I don't think I set anything
specific to get to 32bit on my system.  Hmmm, the multcount too?
I'm starting to think, if this is your output from 2.4.20-pre2-ac4 that
you're hitting a bug in the current code which is REALLY not doing the
right thing for your controller.

>  unmaskirq    =3D  0 (off)
   ^^^^^^^^^^^^^^^^^^^^^^^

  Try hdparm -u1 /dev/hda

>  using_dma    =3D  0 (off)

  And may as well use -d1 too if it works on the device (yes, I know you
said neither kernel enabled it per default).  Then you're after finding
which DMA mode the IDE bus and drive can do, 'man hdparm' for the
possible values (like -X69 if it's all ATA100 capable for UDMA5).
  With a 60GB Maxtor and an 80pin cable I use:

	/sbin/hdparm -u1 -d1 -X69 /dev/hda

root@emelia:~# hdparm -t -T /dev/hda

/dev/hda:
 Timing buffer-cache reads:   128 MB in  0.52 seconds =3D246.15 MB/sec
 Timing buffered disk reads:  64 MB in  2.03 seconds =3D 31.53 MB/sec

Although I'm wondering if with ATA100 and UDMA5 I should be seeing even
better than that.

HTH,

-Ath
--=20
- Athanasius =3D Athanasius(at)miggy.org.uk / http://www.clan-lovely.org/~a=
than/
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