Messages in this thread | | | Date | Thu, 24 Jan 2002 17:03:29 -0800 | From | Andrew Morton <> | Subject | Re: Testing the effects of the low latency patch |
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J Sloan wrote: > > I had earlier posted reports about the low latency patch in terms > that are too subjective - e.g. saying that "quake 3 arena feels much > smoother and I frag a lot more" isn't the kind of hard statistical > evidence demanded by some. I have attempted to quanitify the latency > differences in one of the workloads where I see and feel a difference.
mm. Numbers. Nice.
> > 2.4.18-pre6+tux+nfs-fixes > ------------- > ... > 7.6 1 > 7.8 1 > 21.1 1
This is the stock kernel. In twenty minutes you suffered precisely *one* scheduling overrun which is perceptible by a human. The rest are much shorter than your monitor's refresh interval. Interesting, yes?
These results are better than the ones I normally measure.
> ... > The dbench results: > > 2.4.18-pre6+tux+nfs-fixes > --------------------------------- > ... > Throughput 48.9432 MB/sec (NB=61.179 MB/sec 489.432 MBit/sec) 16 procs > ... > > 2.4.18-pre6+tux+nfs-fixes + low latency patch > --------------------------------- > ... > Throughput 106.361 MB/sec (NB=132.951 MB/sec 1063.61 MBit/sec) 16 procs > ...
Now that's odd.
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