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Date: Fri, 1 Apr 2011 22:59:52 +0800 From: "Lina Lu" <lulina_nuaa@...mail.com> To: "Vivek Goyal" <vgoyal@...hat.com> Cc: "linux kernel mailing list" <linux-kernel@...r.kernel.org> Subject: Re: Re: Re: cfq-iosched.c:Use cfqq->nr_sectors in charge the vdisktime On 2011-04-01 03:47:18, Vivek Goyal wrote: > On Thu, Mar 31, 2011 at 11:46:37PM +0800, Lina Lu wrote: > > On 2011-03-30 23:54:34, Vivek Goyal wrote: > > [..] > > > > Here is 20 sec backtrace: > > http://www.fileden.com/files/2010/9/9/2965145/cfq_log.tar.gz > > > > This time, I set two IO pid with weight 100, and the device is in iops_mod. > > How did you put device in iops mode? What's the device you are using and > what kind of configuration dm-0 and dm-1 are in. I echo 0 to /sys/block/sdb/queue/iosched/slice_idle to put the device in iops mod. Here is the dmsetup table: sdbtest-2: 0 2097152 linear 8:16 23068672 sdbtest-1: 0 2097152 linear 8:16 20971520 Device dm-0 is sdbtest-1, and dm-1 is sdbtest-2. They are all linear logic devices on sdb. > > > linux-kzr4:/home/blkio # cat tst1/blkio.weight > > 100 > > linux-kzr4:/home/blkio # cat tst2/blkio.weight > > 100 > > > > iostat: > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util > > dm-0 0.00 0.00 855.50 0.00 3.34 0.00 8.00 0.82 1.06 0.95 81.70 > > dm-1 0.00 0.00 844.00 0.00 26.38 0.00 64.00 0.83 0.98 0.98 82.60 > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util > > dm-0 0.00 0.00 840.00 0.00 3.28 0.00 8.00 0.90 0.95 1.07 89.55 > > dm-1 0.00 0.00 794.00 0.00 24.81 0.00 64.00 0.87 1.10 1.10 87.00 > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util > > dm-0 0.00 0.00 596.50 0.00 2.33 0.00 8.00 0.96 1.77 1.61 95.80 > > dm-1 0.00 0.00 626.00 0.00 19.56 0.00 64.00 0.94 1.48 1.50 93.70 > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util > > dm-0 0.00 0.00 815.50 0.00 3.19 0.00 8.00 0.81 0.83 1.00 81.40 > > dm-1 0.00 0.00 828.50 0.00 25.89 0.00 64.00 0.77 0.95 0.93 77.45 > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util > > dm-0 0.00 0.00 910.50 0.00 3.56 0.00 8.00 0.82 1.00 0.90 82.15 > > dm-1 0.00 0.00 845.00 0.00 26.41 0.00 64.00 0.81 0.96 0.96 80.95 > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util > > dm-0 0.00 0.00 928.86 0.00 3.63 0.00 8.00 0.79 0.90 0.86 79.45 > > dm-1 0.00 0.00 848.26 0.00 26.51 0.00 64.00 0.65 0.77 0.77 65.17 > > > > >From the result, we can see that the iops match the weight value very well, but > > the rMB/s are not the same as they has different avgrq-sz. > > > > If I use the following patch, the rMB/s will be more accuracy. > > > > --- block/cfq-iosched.c 2011-03-31 23:43:55.000000000 +0800 > > +++ block/cfq-iosched.c 2011-03-31 23:44:30.000000000 +0800 > > @@ -951,7 +951,7 @@ > > used_sl = charge = cfq_cfqq_slice_usage(cfqq); > > > > if (iops_mode(cfqd)) > > - charge = cfqq->slice_dispatch; > > + charge = cfqq->nr_sectors; > > In IOPS mode we calculate the number of IOPS (that is number of requests > dispatched) and not number of sectors. nr_sectors is more of getting > the equal bandwidth even when we are operating at different request sizes. > So instead of operating in iops mode, if you operate in regular time > based mode, you should get better results. > > Why are you not using regular time based fairness mode? > I did the same test in regular time based fairness mode without the above patch. Here is iostat result: Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 1813.00 0.00 7.08 0.00 8.00 0.81 0.42 0.45 81.40 dm-1 0.00 0.00 627.00 0.00 19.59 0.00 64.00 0.92 1.61 1.47 92.20 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 1799.00 0.00 7.03 0.00 8.00 0.80 0.44 0.44 80.00 dm-1 0.00 0.00 660.00 0.00 20.62 0.00 64.00 0.95 1.44 1.43 94.70 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 1875.00 0.00 7.32 0.00 8.00 0.68 0.39 0.36 67.60 dm-1 0.00 0.00 540.00 0.00 16.88 0.00 64.00 0.94 1.59 1.75 94.50 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 1494.06 0.00 5.84 0.00 8.00 0.73 0.45 0.49 73.27 dm-1 0.00 0.00 688.12 0.00 21.50 0.00 64.00 0.90 1.44 1.31 90.40 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 2079.00 0.00 8.12 0.00 8.00 0.80 0.41 0.38 79.50 dm-1 0.00 0.00 623.00 0.00 19.47 0.00 64.00 0.94 1.43 1.50 93.70 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 1991.00 0.00 7.78 0.00 8.00 0.87 0.44 0.44 86.80 dm-1 0.00 0.00 708.00 0.00 22.12 0.00 64.00 0.89 1.25 1.26 89.30 If I apply the above patch, and test in iops mode, the bandwidth will be equal. Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 2579.00 0.00 10.07 0.00 8.00 0.92 0.35 0.36 91.80 dm-1 0.00 0.00 253.00 0.00 7.91 0.00 64.00 0.98 3.93 3.88 98.10 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 2394.00 0.00 9.35 0.00 8.00 0.93 0.40 0.39 93.00 dm-1 0.00 0.00 326.00 0.00 10.19 0.00 64.00 0.91 2.41 2.80 91.30 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 2339.00 0.00 9.14 0.00 8.00 0.91 0.37 0.39 90.50 dm-1 0.00 0.00 267.00 0.00 8.34 0.00 64.00 0.97 4.10 3.63 96.90 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 2298.00 0.00 8.98 0.00 8.00 0.59 0.25 0.26 59.00 dm-1 0.00 0.00 286.00 0.00 8.94 0.00 64.00 0.98 3.43 3.43 98.10 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util dm-0 0.00 0.00 2298.00 0.00 8.98 0.00 8.00 0.37 0.18 0.16 37.00 dm-1 0.00 0.00 292.00 0.00 9.12 0.00 64.00 0.98 2.83 3.35 97.80 But it seens the total performance is lower. Thanks Lina f -- 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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