lkml.org 
[lkml]   [2005]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Where is the performance bottleneck?
Holger Kiehl wrote:

> 3236497 total 1.4547
> 2507913 default_idle 52248.1875
> 158752 shrink_zone 43.3275
> 121584 copy_user_generic_c 3199.5789
> 34271 __wake_up_bit 713.9792
> 31131 __make_request 23.1629
> 22096 scsi_request_fn 18.4133
> 21915 rotate_reclaimable_page 80.5699
^^^^^^^^^

I don't think this function should be here. This indicates that
lots of writeout is happening due to pages falling off the end
of the LRU.

There was a bug recently causing memory estimates to be wrong
on Opterons that could cause this I think.

Can you send in 2 dumps of /proc/vmstat taken 10 seconds apart
while you're writing at full speed (with 2.6.13 or the latest
-git tree).

A dump of /proc/zoneinfo and /proc/meminfo while the write is
going on would be helpful too.

Thanks,
Nick

--
SUSE Labs, Novell Inc.

Send instant messages to your online friends http://au.messenger.yahoo.com

-
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: 2005-08-31 14:27    [from the cache]
©2003-2011 Jasper Spaans