Messages in this thread | | | Date | Sat, 10 Jul 2004 00:26:04 +1000 | From | Con Kolivas <> | Subject | Re: [PATCH] Autotune swappiness |
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Martin J. Bligh wrote: >>>>Here is another try at providing feedback to tune the vm_swappiness. >>> >>> >>>I spent some time yesterday trying to demonstrate performance improvements >>>from those two patches. Using >>> >>> make -j4 vmlinux with mem=64m >>> >>>and >>> >>> qsbench -p 4 -m 96 with mem=256m >>> >>>and was not able to do so, which is what I expected. >>> >>>We do need more quantitative testing on this work. >> >>Sure thing. >> >>I need to point out a few things: >>The point of this patch was to improve the swap behaviour on desktop like loads. >>The fact that it improved the "when swap is thrashing" scenario (in my testing) was an unintentional bonus. >>I dont think your load of j4 will induce quite the same swap thrash as what I was testing. I actually suspect the faster cpu & more jobs over fixed memory shows it more. >>I need someone with more varied hardware to test it for me. I can recreate equivalent results on my current machine which has similar hardware, but I think results showing improvement on different machines and different loads is what you're looking for... and since I'm currently quite low on hardware I can only offer results from this one (and my wife is hating it being offline o_0) >> >>Anyone willing to offer to do some tests? > > > What kind of mem pressure are you looking for? kernel compile is easy to run, > and straight "-j" should kill a small system fairly well ... you want it just > into swap, or thrashing the crap out of it?
It was coincidental that it helped the swap thash scenario. But yes, thrashing the crap out of it. Maybe taking 5-10 times longer than when there's enough memory for the job.
Con [unhandled content-type:application/pgp-signature] | |