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Date: Wed, 28 Jul 2010 16:22:12 -0400 From: Vivek Goyal <vgoyal@...hat.com> To: Heinz Diehl <htd@...cy-poultry.org> Cc: linux-kernel@...r.kernel.org, jaxboe@...ionio.com, nauman@...gle.com, dpshah@...gle.com, guijianfeng@...fujitsu.com, jmoyer@...hat.com, czoccolo@...il.com Subject: Re: [RFC PATCH] cfq-iosched: IOPS mode for group scheduling and new group_idle tunable On Sat, Jul 24, 2010 at 10:06:13AM +0200, Heinz Diehl wrote: > On 23.07.2010, Vivek Goyal wrote: > > > Anyway, for fs_mark problem, can you give following patch a try. > > https://patchwork.kernel.org/patch/113061/ > > Ported it to 2.6.35-rc6, and these are my results using the same fs_mark > call as before: > > slice_idle = 0 > > FSUse% Count Size Files/sec App Overhead > 28 1000 65536 241.6 39574 > 28 2000 65536 231.1 39939 > 28 3000 65536 230.4 39722 > 28 4000 65536 243.2 39646 > 28 5000 65536 227.0 39892 > 28 6000 65536 224.1 39555 > 28 7000 65536 228.2 39761 > 28 8000 65536 235.3 39766 > 28 9000 65536 237.3 40518 > 28 10000 65536 225.7 39861 > 28 11000 65536 227.2 39441 > > > slice_idle = 8 > > FSUse% Count Size Files/sec App Overhead > 28 1000 65536 502.2 30545 > 28 2000 65536 407.6 29406 > 28 3000 65536 381.8 30152 > 28 4000 65536 438.1 30038 > 28 5000 65536 447.5 30477 > 28 6000 65536 422.0 29610 > 28 7000 65536 383.1 30327 > 28 8000 65536 415.3 30102 > 28 9000 65536 397.6 31013 > 28 10000 65536 401.4 29201 > 28 11000 65536 408.8 29720 > 28 12000 65536 391.2 29157 > > Huh...there's quite a difference! It's definitely the slice_idle settings > which affect the results here. > Besides, this patch gives noticeably bad desktop interactivity on my system. Heinz, I also ran linus torture test and fsync-tester on ext3 file system on my SATA disk and with this corrado's fsync patch applied in fact I see better results. 2.6.35-rc6 kernel ================= fsync time: 1.2109 fsync time: 2.7531 fsync time: 1.3770 fsync time: 2.0839 fsync time: 1.4243 fsync time: 1.3211 fsync time: 1.1672 fsync time: 2.8345 fsync time: 1.4798 fsync time: 0.0170 fsync time: 0.0199 fsync time: 0.0204 fsync time: 0.2794 fsync time: 1.3525 fsync time: 2.2679 fsync time: 1.4629 fsync time: 1.5234 fsync time: 1.5693 fsync time: 1.7263 fsync time: 3.5739 fsync time: 1.4114 fsync time: 1.5517 fsync time: 1.5675 fsync time: 1.3818 fsync time: 1.8127 fsync time: 1.6394 2.6.35-rc6-fsync ================ fsync time: 3.8638 fsync time: 0.1209 fsync time: 2.3390 fsync time: 3.1501 fsync time: 0.1348 fsync time: 0.0879 fsync time: 1.0642 fsync time: 0.2153 fsync time: 0.1166 fsync time: 0.2744 fsync time: 0.1227 fsync time: 0.2072 fsync time: 0.0666 fsync time: 0.1818 fsync time: 0.2170 fsync time: 0.1814 fsync time: 0.0501 fsync time: 0.0198 fsync time: 0.1950 fsync time: 0.2099 fsync time: 0.0877 fsync time: 0.8291 fsync time: 0.0821 fsync time: 0.0777 fsync time: 0.0258 fsync time: 0.0574 fsync time: 0.1152 fsync time: 1.1466 fsync time: 0.2349 fsync time: 0.9589 fsync time: 1.1013 fsync time: 0.1681 fsync time: 0.0902 fsync time: 0.2052 fsync time: 0.0673 I also did "time firefox &" testing to see how long firefox takes to launch when linus torture test is running and without patch it took around 20 seconds and with patch it took around 17 seconds. So to me above test results suggest that this patch does not worsen the performance. In fact it helps. (at least on ext3 file system.) Not sure why are you seeing different results with XFS. 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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