From: Fernando Silveira <fsilveira@gmail.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: I/O and pdflush
Date: Mon, 31 Aug 2009 11:33:43 -0300 [thread overview]
Message-ID: <6afc6d4a0908310733l6426e21fu11d826f6ffa6a2af@mail.gmail.com> (raw)
In-Reply-To: <20090831140713.GA24185@localhost>
[-- Attachment #1: Type: text/plain, Size: 1483 bytes --]
On Mon, Aug 31, 2009 at 11:07, Wu Fengguang<fengguang.wu@intel.com> wrote:
> On Mon, Aug 31, 2009 at 10:01:13PM +0800, Wu Fengguang wrote:
>> On Mon, Aug 31, 2009 at 10:00:06PM +0800, Wu Fengguang wrote:
>> > Hi Fernando,
>> >
>> > What's your SSD's IO parameters? Ie. output of this command:
>> >
>> > grep -r . /sys/block/sda/queue/
>> >
>> > Please replace 'sda' with your SSD device name.
>>
>> Oh I guess it's sdc:
>>
>> grep -r . /sys/block/sdc/queue/
Here is it:
# grep -r . /sys/block/sdc/queue/
/sys/block/sdc/queue/nr_requests:128
/sys/block/sdc/queue/read_ahead_kb:128
/sys/block/sdc/queue/max_hw_sectors_kb:128
/sys/block/sdc/queue/max_sectors_kb:128
/sys/block/sdc/queue/scheduler:noop anticipatory [deadline] cfq
/sys/block/sdc/queue/hw_sector_size:512
/sys/block/sdc/queue/rotational:0
/sys/block/sdc/queue/nomerges:0
/sys/block/sdc/queue/rq_affinity:0
/sys/block/sdc/queue/iostats:1
/sys/block/sdc/queue/iosched/read_expire:500
/sys/block/sdc/queue/iosched/write_expire:5000
/sys/block/sdc/queue/iosched/writes_starved:2
/sys/block/sdc/queue/iosched/front_merges:1
/sys/block/sdc/queue/iosched/fifo_batch:16
#
These are probably default settings.
> BTW, would you run "iostat -x 1 5" (which will run 5 seconds) when
> doing I/O in ideal throughput, and when in 25MB/s thoughput state?
Both files are attached (25mbps = 25MB/s, 80mbps = 80MB/s).
Thanks.
--
Fernando Silveira <fsilveira@gmail.com>
[-- Attachment #2: log-20090831_0908-MK020903042C0001B-prosar_fcc2-bs_4M-0-iostat_x_1_5-80mbps_3.log --]
[-- Type: application/octet-stream, Size: 5411 bytes --]
Linux 2.6.30.1-fs33 (prosar-fcc2) 08/31/2009 _i686_
avg-cpu: %user %nice %system %iowait %steal %idle
0.16 0.00 8.16 74.81 0.00 16.86
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.06 5.50 1.40 7.00 22.13 99.99 14.53 2.07 245.98 29.26 24.59
sda1 0.06 5.50 1.40 7.00 22.09 99.99 14.53 2.07 246.04 29.27 24.59
sdb 1.04 0.00 0.02 0.00 1.16 0.00 74.00 0.00 1.35 0.51 0.00
sdb1 0.04 0.00 0.00 0.00 0.13 0.00 36.53 0.00 0.56 0.44 0.00
sdb2 1.00 0.00 0.01 0.00 1.01 0.00 97.29 0.00 1.82 0.65 0.00
sdc 1.04 46806.13 0.02 368.56 1.16 47172.95 127.99 117.32 318.29 2.24 82.62
sdc1 0.04 0.00 0.00 0.00 0.13 0.00 36.53 0.00 0.71 0.53 0.00
sdc2 1.00 46806.13 0.01 368.56 1.01 47172.95 127.99 117.32 318.30 2.24 82.62
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 27.00 73.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 10.00 0.00 17.00 0.00 216.00 12.71 0.49 6.12 7.76 13.20
sda1 0.00 10.00 0.00 17.00 0.00 216.00 12.71 0.49 6.12 7.76 13.20
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 153328.00 0.00 1196.00 0.00 153088.00 128.00 137.36 114.77 0.84 100.10
sdc1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc2 0.00 153328.00 0.00 1196.00 0.00 153088.00 128.00 137.36 114.77 0.84 100.10
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 27.86 72.14 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 0.00 0.00 8.00 0.00 64.00 8.00 5.41 537.62 125.12 100.10
sda1 0.00 0.00 0.00 8.00 0.00 64.00 8.00 5.41 537.62 125.12 100.10
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 153504.00 0.00 1200.00 0.00 153600.00 128.00 138.35 115.76 0.83 100.10
sdc1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc2 0.00 153504.00 0.00 1200.00 0.00 153600.00 128.00 138.35 115.76 0.83 100.10
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 27.14 72.86 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 1.98 0.00 8.91 0.00 87.13 9.78 2.24 417.44 105.33 93.86
sda1 0.00 1.98 0.00 8.91 0.00 87.13 9.78 2.24 417.44 105.33 93.86
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 149798.02 0.00 1187.13 0.00 151952.48 128.00 137.76 115.17 0.84 99.21
sdc1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc2 0.00 149798.02 0.00 1187.13 0.00 151952.48 128.00 137.76 115.17 0.84 99.21
avg-cpu: %user %nice %system %iowait %steal %idle
0.50 0.00 23.38 76.12 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 1.00 0.00 12.00 0.00 104.00 8.67 0.09 7.42 5.75 6.90
sda1 0.00 1.00 0.00 12.00 0.00 104.00 8.67 0.09 7.42 5.75 6.90
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 129120.00 0.00 1013.00 0.00 129664.00 128.00 139.81 116.65 0.99 100.00
sdc1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc2 0.00 129120.00 0.00 1013.00 0.00 129664.00 128.00 139.81 116.65 0.99 100.00
[-- Attachment #3: log-20090831_0908-MK020903042C0001B-prosar_fcc2-bs_4M-0-iostat_x_1_5-25mbps.log --]
[-- Type: application/octet-stream, Size: 5395 bytes --]
Linux 2.6.30.1-fs33 (prosar-fcc2) 08/31/2009 _i686_
avg-cpu: %user %nice %system %iowait %steal %idle
0.16 0.00 7.93 74.27 0.00 17.64
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.07 5.72 0.57 6.91 15.94 101.03 15.63 2.12 283.40 32.21 24.11
sda1 0.07 5.72 0.57 6.91 15.91 101.03 15.63 2.12 283.48 32.22 24.11
sdb 1.10 0.00 0.02 0.00 1.23 0.00 74.00 0.00 1.35 0.51 0.00
sdb1 0.05 0.00 0.00 0.00 0.14 0.00 36.53 0.00 0.56 0.44 0.00
sdb2 1.06 0.00 0.01 0.00 1.07 0.00 97.29 0.00 1.82 0.65 0.00
sdc 1.10 45638.09 0.02 359.34 1.23 45995.35 128.00 115.88 322.44 2.27 81.58
sdc1 0.05 0.00 0.00 0.00 0.14 0.00 36.53 0.00 0.71 0.53 0.00
sdc2 1.06 45638.09 0.01 359.34 1.07 45995.35 128.00 115.88 322.45 2.27 81.58
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 4.00 96.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 1.00 0.00 5.00 0.00 48.00 9.60 0.41 82.20 52.40 26.20
sda1 0.00 1.00 0.00 5.00 0.00 48.00 9.60 0.41 82.20 52.40 26.20
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 24384.00 0.00 197.00 0.00 25216.00 128.00 142.38 361.40 5.08 100.10
sdc1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc2 0.00 24384.00 0.00 197.00 0.00 25216.00 128.00 142.38 361.40 5.08 100.10
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 13.00 87.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 0.00 0.00 9.00 0.00 72.00 8.00 0.99 110.56 59.33 53.40
sda1 0.00 0.00 0.00 9.00 0.00 72.00 8.00 0.99 110.56 59.33 53.40
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 69088.00 0.00 552.00 0.00 70656.00 128.00 142.75 386.39 1.81 100.10
sdc1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc2 0.00 69088.00 0.00 552.00 0.00 70656.00 128.00 142.75 386.39 1.81 100.10
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 6.00 94.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 10.00 0.00 9.00 0.00 144.00 16.00 4.36 169.89 84.22 75.80
sda1 0.00 10.00 0.00 9.00 0.00 144.00 16.00 4.36 169.89 84.22 75.80
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 26543.00 0.00 195.00 0.00 24960.00 128.00 143.91 298.28 5.13 100.10
sdc1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc2 0.00 26543.00 0.00 195.00 0.00 24960.00 128.00 143.91 298.28 5.13 100.10
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 12.00 88.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 0.00 0.00 7.00 0.00 64.00 9.14 5.02 947.00 143.00 100.10
sda1 0.00 0.00 0.00 7.00 0.00 64.00 9.14 5.02 947.00 143.00 100.10
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 70993.00 0.00 568.00 0.00 72704.00 128.00 142.37 403.06 1.76 100.10
sdc1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc2 0.00 70993.00 0.00 568.00 0.00 72704.00 128.00 142.37 403.06 1.76 100.10
next prev parent reply other threads:[~2009-08-31 14:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-11 17:27 Fernando Silveira
2009-07-12 8:04 ` Wu Fengguang
2009-08-28 21:48 ` Fernando Silveira
2009-08-29 10:12 ` Wu Fengguang
2009-08-29 10:21 ` Wu Fengguang
2009-08-31 13:24 ` Fernando Silveira
2009-08-31 14:00 ` Wu Fengguang
2009-08-31 14:01 ` Wu Fengguang
2009-08-31 14:07 ` Wu Fengguang
2009-08-31 14:33 ` Fernando Silveira [this message]
2009-09-01 8:14 ` Wu Fengguang
[not found] ` <6afc6d4a0909010710l2cf77fbbmb1ab192ed12a7efc@mail.gmail.com>
2009-09-02 3:05 ` Wu Fengguang
[not found] ` <6afc6d4a0909020429l2bfecee9xd00527fcaa323751@mail.gmail.com>
[not found] ` <20090902125057.GA7982@localhost>
[not found] ` <6afc6d4a0909031346qda0b17coe4c60250fcac827f@mail.gmail.com>
2009-09-04 2:21 ` Wu Fengguang
2009-09-04 2:34 ` Wu Fengguang
[not found] <cWOyL-3Ys-15@gated-at.bofh.it>
2009-08-31 21:57 ` Daniel J Blueman
2009-09-01 14:33 ` Fernando Silveira
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