Messages in this thread | | | Date | Tue, 28 Jul 2009 19:36:31 +0800 | From | Gui Jianfeng <> | Subject | Re: [RFC] IO scheduler based IO controller V6 |
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Vivek Goyal wrote: > On Mon, Jul 27, 2009 at 10:10:34AM +0800, Gui Jianfeng wrote: >> Hi, >> >> Here are some fio test results for IO Controller V6 built and not built. >> Iozone test results are also attached. >> > > Hi Gui, > > Thanks a lot for some performance numbers. It seems to be a mixed chart. > Performance gains at some places and loss at others. I am curious about > that -7.0% for normal writes. Not sure what can contribute to that. > > What was the value of "fairness" parameter when you ran those tests? Can you > please set fairness = 0 and re-run the tests (if you have already not done so). > > By default fairness is set to 1 in V6. With fairness = 0, we should be very > close to existing CFQ behavior. If not, then we need to dive deeper and > see why variations are happening.
Hi Vivek,
I tested with default fairness value, i'll re-test it when fairness is set to 0.
> > Is it also possible to run the same tests with V7.
Sure.
-- Regards Gui Jianfeng
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