ULE vs. 4BSD in RELENG_7

[Jeff Roberson]

On Sun, 4 Nov 2007, Josh Carroll wrote:

>> Josh, thanks for your help so far.  This has been very useful.
>
> You're welcome, glad to help! Thanks for the effort and the patch.
>
>> Any testing you can run this through is appreciated.  Anyone else lurking
>> in this thread who would like to is also welcome to report back findings.
>
> Here are a few benchmarks comparing ULE and the patched ULE. I
> experimented in changing the slice_min value from 2 to 4, in case that
> might be useful info for you. Hopefully that helps a bit, but if not
> it's just a few minutes of CPU time wasted :)

Josh, I included one too many changes in the diff and it made the results 
ambiguous.  I've scaled it back slightly by removing the changes to 
sched_pickcpu() and included the patch in this email again.  Can you run 
through your tests once more?  I'd like to commit this part soon as it 
helps in other cases.  I'm most interested in the buildworld numbers for 
now.

Thanks,
Jeff

>
> Sysbench results:
> # threads    slice=7     slice=13     slice_min=4      slice_min=2
> 4                2265.67    2250.36      2261.71            2297.08
> 8                2300.25    2310.02      2306.79            2313.61
> 12              2269.54    2304.04      2296.54            2279.73
> 16              2249.26    2252.04      2260.53            2245.76
>
> It looks like with the default minimum (2), the performance for systat
> is better with 4 and 8 threads (on a 4 core system), but worse for 12
> and 16 threads.
>
> Here are the results for ffmpeg (-threads 8):
>
> slice=7      slice=13       slice_min=4         slice_min=2
> 1:37.00      1:39.09         1:38.12                1:38.06
>
> The patch definitely improves things there, though not quite as good
> as using a slice value of 7. But it does improve things. So it
> slightly improves things for ffmpeg and also slightly increases the
> performance of sysbench/MySQL (with 8 threads).
>
> I also ran through buildworld for both slice_min of 2 and 4, and here
> are the results, again with ULE as a base line:
>
> slice=7      slice=13       slice_min=4         slice_min=2
> 13:40.56    13:44.28       13:46.64              13:45.80
>
> So buildworld performance is about the same as with the default ULE
> and default slice value.
>
> Thanks,
> Josh
> _______________________________________________
> freebsd-performance at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-performance
> To unsubscribe, send any mail to "freebsd-performance-unsubscribe at freebsd.org"
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: uleslice.diff
Type: text/x-diff
Size: 17378 bytes
Desc: 
Url : http://lists.freebsd.org/pipermail/freebsd-performance/attachments/20071104/32ae0b27/uleslice.bin