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Message-Id: <200803221406.02621.bernd-schubert@gmx.de> Date: Sat, 22 Mar 2008 14:06:01 +0100 From: Bernd Schubert <bernd-schubert@....de> To: Aaron Carroll <aaronc@...ato.unsw.edu.au> Cc: linux-kernel@...r.kernel.org Subject: Re: deadline unfairness Hello Aron, On Saturday 22 March 2008, Aaron Carroll wrote: > Bernd Schubert wrote: > > Hello, > > > > some it seems the deadline scheduler is rather unfair. Below is an > > example of md-raid6 initialization of md3, md4 and md5. All three > > md-devices do share the same blockdevices (we have patched md to allow > > parallel rebuild of shared block devices, since for us the cpu is the > > bottleneck and not the block device). > > > > All rebuilds started basically at the same time, as you can see, md3 is > > already done and now md4 rebuilds substantially faster than md5. > > [..] > > This is basically with a 2.6.22 kernel + lustre + md-backports, but > > nothing done to the scheduler. > > Hi Bernd, > > There is a deadline bug in pre-2.6.24 kernels where lower-sector requests > can starve higher-sector requests; you might be hitting this bug. It was > fixed by commit: 6f5d8aa6382eef2b26032c88656270bdae7f0c42 thanks a lot for your help! I will build a new kernel later on today and then report back if it helps. Commit dfb3d72a9aa519672c9ae06f0d2f93eccb35482f also looks useful... Thanks again, Bernd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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