lkml.org 
[lkml]   [2006]   [Apr]   [11]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateTue, 11 Apr 2006 20:43:12 +0200 (MEST)
FromJan Engelhardt <>
SubjectRe: 40% IDE performance regression going from FC3 to FC5 with same kernel
>> > I'll be filing a FC5 performance bug for this but would like an opinion
>> >  from the IDE kernel people just in case this has already been seen...
>> >
>> > I just upgraded my home K7-800, 512MB RAM box from FC3 to FC5
>> >  and noticed a disk performance slowdown while copying files around.
>>
>> Just another suggestion: try eliminating/pinpointing I/O scheduler issues
>> (switch e.g. to "noop" at /sys/block/hda/queue/scheduler and compare again)
>
>Thanks Andi. Tried every scheduler (my default is anticipatory) and
> there aren't meaningful differences - 18.3 to 18.6MB/s.
>
>As a further data point, my box can burn a 8x DVD+R at up to 7.1x
> average speed under FC3, while it barely keeps up with 4x in FC5.

Since you said it happens with the same kernel, I think it's caused by 
userspace (do the boot-with-"-b" thing and you'll know). Possible someone 
setting DMA to speeds as low as udma4 or udma2.


Jan Engelhardt
-- 
-
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: 2006-04-11 18:45    [from the cache]
©2003-2008