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* VM: 2.4.10ac4 vs. 2.4.11pre2
@ 2001-10-06 12:20 chris
  2001-10-06 19:05 ` Mike Fedyk
  2001-10-06 22:36 ` Andrea Arcangeli
  0 siblings, 2 replies; 5+ messages in thread
From: chris @ 2001-10-06 12:20 UTC (permalink / raw)
  To: linux-kernel


Here are some test results. Results are averaged over multiple runs.
Comments and conclusions below.

                     2.4.11pre2        2.4.10ac4
dbench 8             34Mbyte/sec       40Mbyte/sec
dbench 32            7.7Mbyte/sec      14Mbyte/sec
bonnie++ write       17.5Mbyte/sec     18Mbyte/sec
bonnie++ rewrite     5.6Mbyte/sec      5.8Mbyte/sec
bonnie++ read        24Mbyte/sec       24.5Mbyte/sec
kernel stress build  212min24s         229m54s
linear swap test     1m30s             2m15s
bonnie++ creat()     7200              9600  [*]
bonnie++ stat()      2100              9000  [*]
bonnie++ unlink()    5300              30000 [*]

[*] either the ext2 directory optimization in 2.4.10ac is influencing the
test, or 2.4.11pre2 VM has a problem caching inodes.

Comments + conclusions

- The 2.4.11pre2 VM is considerably more stable, where "stable" is defined
as repeatable test scores and consistent performance. The 2.4.10ac4 VM is
all over the place.

- Both kernels exhibit similar interactive response under load.

- The 2.4.11pre2 VM performs substantially better in tests which invoke

- Surprisingly, the 2.4.10ac4 kernel does much much better at dbench. The
2.4.11pre2 performance is alleged to have regressed since 2.4.10pre10?

- I have not tried 2.4.11pre4, but the report of streaming i/o causing
swapping is concerning.

Note that the above results were generated using a very simple (and
extensible) script. VM developers would do well to spend the 30 seconds
writing a similar script, and post results along with proposed VM patches.


^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: VM: 2.4.10ac4 vs. 2.4.11pre2
@ 2001-10-06 19:09 Alexei Podtelezhnikov
  0 siblings, 0 replies; 5+ messages in thread
From: Alexei Podtelezhnikov @ 2001-10-06 19:09 UTC (permalink / raw)
  To: chris; +Cc: linux-kernel


Can you elaborate on "all over the place" by posting standard deviations 
of your measurements, or the entire sets? I guess you did about 6-10 of 
each. I think it's important since - who cares about good average 
performance if once in a while VM fails miserably. 

To emphasize the importance of this: I would expect that large deviations 
are more likely during short spikes of activity. It would be interesting 
to see how start-up times of mozilla vary having your linear swap 
test on the background. Too much to ask anyway.

Your conclusion about poor swapping with ac kernels is consistent with 
earlier posts ("VM: more numbers").


^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2001-10-06 22:38 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2001-10-06 12:20 VM: 2.4.10ac4 vs. 2.4.11pre2 chris
2001-10-06 19:05 ` Mike Fedyk
2001-10-06 19:50   ` Rik van Riel
2001-10-06 22:36 ` Andrea Arcangeli
2001-10-06 19:09 Alexei Podtelezhnikov

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