lkml.org 
[lkml]   [2003]   [Dec]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.6.0 performance problems
On Tue, 2003-12-30 at 00:58, Thomas Molina wrote:
>> It certainly looks like DMA is enabled. Under 2.4 I get:
>> [root@lap root]# hdparm /dev/hda
[...]
>> readahead = 8 (on)
[...]
>> Under 2.6 I get:
>> [root@lap root]# hdparm /dev/hda
[...]
>> readahead = 256 (on)

On Tue, Dec 30, 2003 at 01:14:45AM +0200, Martin Schlemmer wrote:
> Increase your readahead:
> # hdparm -a 8192 /dev/hda
> BTW: As we really do get this question a _lot_ of times, why
> don't the ide layer automatically set a higher readahead
> if there is enough cache on the drive or something?

Could you try lowering 2.6's readahead to 2.4's levels in order to rule
out readahead-induced thrashing?


-- wli
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:59    [W:0.111 / U:0.840 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site