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.
-- RegardsGui Jianfeng
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