lkml.org 
[lkml]   [2001]   [Sep]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] reiserfs speedup for 2.4.9+
On Sat, Sep 22, 2001 at 05:39:37PM -0400, Chris Mason wrote:
>
> Hello everyone,

Hello Chris,

> Beau pointed me towards a performance bug in reiserfs, where reiserfs_write_super would be called excessively.
>
> Turns out that 2.4.9 included some new super handling code that
> interacted poorly with how reiserfs uses kupdated calls to
> write_super to trigger writebacks of metadata.
>
> This is most obvious with benchmarks like bonnie++, where
> 2.4.9 and 2.4.10 reiserfs do very poorly.
>
> This patch makes things much better in my tests, I'd appreciate
> a few more testers. The only risk is reiserfs using slightly
> more memory, but only if I've screwed something up.

Just to share my two cents. First I have to tell that the skipping
of alsaplayer playing .wav files I experienced during kernel compiles
or other activities is almost completly gone. Furthermore I did some
performance testing of kernel compiles (actions that are done:
untar kernel, patch kernel, make -j50 bzImage modules, 5 times in a
row). These are the results of plain 2.4.10-pre14aa1:

Elapsed (wall clock) time (h:mm:ss or m:ss): 6:25.90
Elapsed (wall clock) time (h:mm:ss or m:ss): 6:15.43
Elapsed (wall clock) time (h:mm:ss or m:ss): 6:01.95
Elapsed (wall clock) time (h:mm:ss or m:ss): 6:12.56
Elapsed (wall clock) time (h:mm:ss or m:ss): 6:35.61

And here are the results of 2.4.10-pre14aa1 + your patch:

Elapsed (wall clock) time (h:mm:ss or m:ss): 5:23.55
Elapsed (wall clock) time (h:mm:ss or m:ss): 5:32.21
Elapsed (wall clock) time (h:mm:ss or m:ss): 5:34.77
Elapsed (wall clock) time (h:mm:ss or m:ss): 6:17.55
Elapsed (wall clock) time (h:mm:ss or m:ss): 5:49.31

Is the performance fix also required for 2.4.9-acXX ?

Regards,

Jogi

--

Well, yeah ... I suppose there's no point in getting greedy, is there?

<< Calvin & Hobbes >>
-
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 13:03    [W:0.036 / U:0.116 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site