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Message-ID: <4e5e476b0911230822p4ddaf0cbv187c2bea29cba932@mail.gmail.com> Date: Mon, 23 Nov 2009 17:22:09 +0100 From: Corrado Zoccolo <czoccolo@...il.com> To: Vivek Goyal <vgoyal@...hat.com> Cc: "Alan D. Brunelle" <Alan.Brunelle@...com>, linux-kernel@...r.kernel.org, jens.axboe@...cle.com Subject: Re: [RFC] Block IO Controller V2 - some results Hi Vivek, On Mon, Nov 23, 2009 at 4:19 PM, Vivek Goyal <vgoyal@...hat.com> wrote: > Hi Corrado, > > This patch seems to be working much better in marking the random writer > queue as sync and not interefere with sync-noidle workload. > > So frequent migration of random writer queue across group has stopped. Great. I think this is good regardless of cgroups, to fix the fairness issue regarding deep aio sync writers against random readers you reported, so I'll send it to Jens. > But there seems to be a different issue now after sometime, random writer > queue stops generating enough traffic and gets deleted after one request > and root group now runs random reader for sometime. So it basically > changes the ratio in which random writers and random readers get disk > share. > > I guess part of the dependency comes from kjournald which is in root > group. But there is something else too because I don't see this happening > when there are no cgroups. I will do more debugging on this. Ok. Thanks, Corrado > Thanks > Vivek > -- 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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