On Wed, Sep 02, 2009 at 08:58:38AM +0800, Gui Jianfeng wrote: > Vivek Goyal wrote: > > Hi All, > > > > Here is the V9 of the IO controller patches generated on top of 2.6.31-rc7. > > > > For ease of patching, a consolidated patch is available here. > > > > http://people.redhat.com/~vgoyal/io-controller/io-scheduler-based-io-controller-v9.patch > > > > Changes from V8 > > =============== > > - Implemented bdi like congestion semantics for io group also. Now once an > > io group gets congested, we don't clear the congestion flag until number > > of requests goes below nr_congestion_off. > > > > This helps in getting rid of Buffered write performance regression we > > were observing with io controller patches. > > > > Gui, can you please test it and see if this version is better in terms > > of your buffered write tests. > > Hi Vivek, > > Here are some performance numbers generated by fio test. It seems V9 performance is better > than V8 especially for write case. > > Normal Read | Random Read | Normal Write | Random Write > > V8(Avg of 3 timers) 64667 KiB/s 3387 KiB/s 59197 KiB/s 9327 KiB/s > > V9(Avg of 3 timers) 65947 KiB/s 3528 KiB/s 61654 KiB/s 9744 KiB/s > > Performance +2.0% +4.1% +4.2% +4.5% Thanks Gui. I was also keen to know how does the vanilla kernel and V9 comparision look like? Can you please run the same tests with vanilla kernel also? Thanks Vivek -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
