Messages in this thread | | | Date | Mon, 21 Jan 2002 18:52:18 -0200 (BRST) | From | Marcelo Tosatti <> | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable |
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On 21 Jan 2002, Robert Love wrote:
> On Mon, 2002-01-21 at 16:49, yodaiken@fsmlabs.com wrote: > > > > (average of 4 runs of `dbench 16') > > > 2.5.3-pre1: 25.7608 MB/s > > > 2.5.3-pre1-preempt: 32.341 MB/s > > > > > > (old, average of 4 runs of `dbench 16') > > > 2.5.2-pre11: 24.5364 MB/s > > > 2.5.2-pre11-preempt: 27.5192 MB/s > > > Robert, with all due respect, my tests of dbench show such high > > variation that 4 miserable runs prove exactly nothing. > > Well you asked for dbench. Would you prefer 10 runs each? There were, > however, no statistical anomalies and the variation was low enough such > that I suspect I could construct a reasonable confidence interval from > these 16 runs. > > I've run these tests over and over again sufficiently that the > repeatability of obtaining improved marks under a preemptive kernel is > evident to me. > > You can see very old (2.4.6) yet still positive results from Nigel, too: > http://kpreempt.sourceforge.net. > > I guess the point is, everyone argues preemption is detrimental to > throughput. I'm not going to argue that we aren't adding complexity, > because clearly we are. But now we have tests showing throughput is > improved and people still argue. I've seen the same behavior under > bonnie, timing kernel compiles, etc ...
Sure, you've seen it. But _why_ it happens ?
That is the point.
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