lkml.org 
[lkml]   [2002]   [Aug]   [23]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateFri, 23 Aug 2002 12:01:52 +0100
FromAthanasius <>
SubjectRe: 2.4.20-pre2-ac4 IDE is slow
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.)
> > 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?> > > If it helps: output of hdparm /dev/hda> > /dev/hda:>  multcount    =  0 (off)
>  IO_support   =  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    =  0 (off)
   ^^^^^^^^^^^^^^^^^^^^^^^

  Try hdparm -u1 /dev/hda

>  using_dma    =  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 =246.15 MB/sec
 Timing buffered disk reads:  64 MB in  2.03 seconds = 31.53 MB/sec

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

HTH,

-Ath
-- 
- Athanasius = Athanasius(at)miggy.org.uk / http://www.clan-lovely.org/~athan/
                  Finger athan(at)fysh.org for PGP key
	   "And it's me who is my enemy. Me who beats me up.
Me who makes the monsters. Me who strips my confidence." Paula Cole - ME
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2005-03-22 12:22    [from the cache]
©2003-2008