On Sun, Aug 12, 2001 at 11:00:31AM -0300, Rik van Riel wrote:
> On Sun, 12 Aug 2001, Alan Cox wrote:
>
> > > Here, disk write throughput seems to want some tweaking, and Bonnie
> > > doing it's rewrite test triggers a very large and persistant inactive
> > > shortage which shouldn't be there (imho).
> >
> > This is one of the reasons I kept the 2.4.7 vm. The 2.4.8 vm is better
> > than 2.4.8pre but not actually better than the older VM by feel or
> > measurement on my test boxes
>
> There are some open-ended questions wrt. the use-once idea,
> its implementation and the way the thing has been integrated
> with the rest of the kernel.
>
> Some suspect interactions and some things which just aren't
> clear yet don't make it seem the best idea to start integrating
> the use-once idea in mainli^W-ac yet...
Is it possible that this causes the slowdown I see when I benchmark
kernel compilations? Doing make -j2 bzImage modules on 2.4.7 gives:
User time (seconds): 279.62
System time (seconds): 22.19
Percent of CPU this job got: 77%
Elapsed (wall clock) time (h:mm:ss or m:ss): 6:29.95
...
Major (requiring I/O) page faults: 1085696
Minor (reclaiming a frame) page faults: 1263226
With 2.4.8 (default bdflush settings):
User time (seconds): 280.75
System time (seconds): 21.46
Percent of CPU this job got: 71%
Elapsed (wall clock) time (h:mm:ss or m:ss): 7:04.14
...
Major (requiring I/O) page faults: 1085927
Minor (reclaiming a frame) page faults: 1263289
With 2.4.8 (and 50/75 bdflush settings):
User time (seconds): 282.20
System time (seconds): 20.82
Percent of CPU this job got: 71%
Elapsed (wall clock) time (h:mm:ss or m:ss): 7:03.27
...
Major (requiring I/O) page faults: 1094004
Minor (reclaiming a frame) page faults: 1265526
Since 2.4.8 should be better when running short of memory I tried
make -j bzImage modules also, with 2.4.7:
User time (seconds): 294.16
System time (seconds): 32.70
Percent of CPU this job got: 32%
Elapsed (wall clock) time (h:mm:ss or m:ss): 16:40.38
...
Major (requiring I/O) page faults: 1560301
Minor (reclaiming a frame) page faults: 1601194
and with 2.4.8 (default bdflush)
User time (seconds): 293.57
System time (seconds): 50.55
Percent of CPU this job got: 24%
Elapsed (wall clock) time (h:mm:ss or m:ss): 23:35.30
...
Major (requiring I/O) page faults: 1592833
Minor (reclaiming a frame) page faults: 1556612
System is an Athlon-1.2GHz with 256MB DDR-Ram.
If you want further compilation benchmarks just let me know.
Regards,
Jogi
--Well, yeah ... I suppose there's no point in getting greedy, is there?
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