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Date: Tue, 17 Nov 2009 15:38:09 -0500 From: "Alan D. Brunelle" <Alan.Brunelle@...com> To: Vivek Goyal <vgoyal@...hat.com> Cc: jens.axboe@...cle.com, linux-kernel@...r.kernel.org Subject: Re: [RFC] Block IO Controller V2 - some results Hi Vivek - I've updated the runs - the results are shown at the end, I culled out the write-related runs (haven't converted to direct I/O yet for those). Next steps: Going to refresh to V3 of the patches and add in http://groups.google.com/group/linux.kernel/browse_thread/thread/3b62f0665f0912b6/34ec9456c7da1bb7?lnk=raot and convert the write-side to doing direct I/O (that would include the rdwr tests, btw). ---------------------------------------------------------------------- I've relabeled things: i0 = io control generated in the kernel, but not enabled i1 = io control generated in the kernel, and is enabled g0 = group_idle=0 g1 = group_idle=1 (default) s8 = slide_idle=8 (default) s0 = slice_idle=0 It looks like when the io control stuff is enabled we have random read problems. When it is enabled and slice_idle is set to 0 we see sequential reads drop noticeably: ---- ---- - --------- --------- --------- --------- --------- --------- Mode RdWr N base i0,gX,sX i1,g1,s8 i1,g0,s8 i1,g1,s0 i1,g0,s0 ---- ---- - --------- --------- --------- --------- --------- --------- rnd rd 2 17.3 17.1 9.1 9.3 9.4 9.5 rnd rd 4 27.1 27.1 8.2 8.0 8.0 8.0 rnd rd 8 37.1 37.1 7.1 6.8 6.7 6.8 seq rd 2 610.2 608.1 607.7 611.0 551.1 550.3 seq rd 4 608.4 601.5 607.7 609.6 549.6 550.0 seq rd 8 605.7 603.7 604.0 605.6 547.2 546.7 =============================================================== ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- Test Mode RdWr N test0 test1 test2 test3 test4 test5 test6 test7 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- base rnd rd 2 8.6 8.6 base rnd rd 4 6.8 6.8 6.8 6.7 base rnd rd 8 4.7 4.6 4.6 4.6 4.6 4.6 4.6 4.6 base seq rd 2 306.2 304.0 base seq rd 4 150.1 152.4 151.9 154.0 base seq rd 8 77.2 75.9 75.9 73.9 77.0 75.7 75.0 74.9 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- Test Mode RdWr N test0 test1 test2 test3 test4 test5 test6 test7 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- i0,gX,sX rnd rd 2 8.6 8.6 i0,gX,sX rnd rd 4 6.8 6.8 6.7 6.7 i0,gX,sX rnd rd 8 4.7 4.6 4.6 4.7 4.6 4.6 4.6 4.6 i0,gX,sX seq rd 2 303.1 305.0 i0,gX,sX seq rd 4 150.8 151.6 149.0 150.2 i0,gX,sX seq rd 8 77.0 76.3 74.5 74.0 77.9 75.5 74.0 74.6 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- Test Mode RdWr N test0 test1 test2 test3 test4 test5 test6 test7 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- i1,g1,s8 rnd rd 2 2.8 6.3 i1,g1,s8 rnd rd 4 0.7 1.5 2.5 3.5 i1,g1,s8 rnd rd 8 0.2 0.4 0.5 0.7 0.9 1.2 1.4 1.7 i1,g1,s8 seq rd 2 221.6 386.1 i1,g1,s8 seq rd 4 70.6 128.1 181.7 227.3 i1,g1,s8 seq rd 8 21.4 40.3 55.8 71.2 85.1 99.1 109.4 121.7 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- Test Mode RdWr N test0 test1 test2 test3 test4 test5 test6 test7 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- i1,g0,s8 rnd rd 2 4.7 4.7 i1,g0,s8 rnd rd 4 2.0 2.0 2.0 2.0 i1,g0,s8 rnd rd 8 0.9 0.9 0.9 0.8 0.8 0.8 0.9 0.9 i1,g0,s8 seq rd 2 305.9 305.0 i1,g0,s8 seq rd 4 154.0 153.3 151.2 151.1 i1,g0,s8 seq rd 8 76.1 76.1 74.5 74.9 75.4 75.8 76.1 76.6 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- Test Mode RdWr N test0 test1 test2 test3 test4 test5 test6 test7 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- i1,g1,s0 rnd rd 2 4.7 4.7 i1,g1,s0 rnd rd 4 2.0 2.0 2.0 2.0 i1,g1,s0 rnd rd 8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.9 i1,g1,s0 seq rd 2 275.6 275.5 i1,g1,s0 seq rd 4 136.0 137.5 137.4 138.7 i1,g1,s0 seq rd 8 68.6 68.6 68.5 68.6 67.1 68.6 68.3 68.9 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- Test Mode RdWr N test0 test1 test2 test3 test4 test5 test6 test7 ----------- ---- ---- - ----- ----- ----- ----- ----- ----- ----- ----- i1,g0,s0 rnd rd 2 4.7 4.7 i1,g0,s0 rnd rd 4 2.0 2.0 2.0 2.0 i1,g0,s0 rnd rd 8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.9 i1,g0,s0 seq rd 2 275.2 275.1 i1,g0,s0 seq rd 4 136.7 137.2 137.5 138.7 i1,g0,s0 seq rd 8 68.8 68.2 68.5 68.4 67.2 68.8 68.4 68.5 -- 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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