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Date: Mon, 27 Jul 2009 17:11:23 +0400
From: Vladislav Bolkhovitin <vst@...b.net>
To: Ronald Moesbergen <intercommit@...il.com>
CC: fengguang.wu@...el.com, linux-kernel@...r.kernel.org,
akpm@...ux-foundation.org, kosaki.motohiro@...fujitsu.com,
Alan.Brunelle@...com, linux-fsdevel@...r.kernel.org,
jens.axboe@...cle.com, randy.dunlap@...cle.com,
Bart Van Assche <bart.vanassche@...il.com>
Subject: Re: [RESEND] [PATCH] readahead:add blk_run_backing_dev
Ronald Moesbergen, on 07/22/2009 12:44 PM wrote:
> 2009/7/20 Vladislav Bolkhovitin <vst@...b.net>:
>>>> The last result comes close to 100MB/s!
>>> Good! Although I expected maximum with a single thread.
>>>
>>> Can you do the same set of tests with deadline scheduler on the server?
>> Case of 5 I/O threads (default) will also be interesting. I.e., overall,
>> cases of 1, 2 and 5 I/O threads with deadline scheduler on the server.
>
> Ok. The results:
>
> Cfq seems to perform better in this case.
>
> client kernel: 2.6.26-15lenny3 (debian)
> server kernel: 2.6.29.5 with readahead-context, blk_run_backing_dev
> and io_context
> server scheduler: deadline
>
> With one IO thread:
> 5) client: default, server: default
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 16.067 16.883 16.096 62.669 1.427 0.979
> 33554432 16.034 16.564 16.050 63.161 0.948 1.974
> 16777216 16.045 15.086 16.709 64.329 2.715 4.021
>
> 6) client: default, server: 64 max_sectors_kb, RA default
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 15.851 15.348 16.652 64.271 2.147 1.004
> 33554432 16.182 16.104 16.170 63.397 0.135 1.981
> 16777216 15.952 16.085 16.258 63.613 0.493 3.976
>
> 7) client: default, server: default max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 15.814 16.222 16.650 63.126 1.327 0.986
> 33554432 16.113 15.962 16.340 63.456 0.610 1.983
> 16777216 16.149 16.098 15.895 63.815 0.438 3.988
>
> 8) client: default, server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 16.032 17.163 15.864 62.695 2.161 0.980
> 33554432 16.163 15.499 16.466 63.870 1.626 1.996
> 16777216 16.067 16.133 16.710 62.829 1.099 3.927
>
> 9) client: 64 max_sectors_kb, default RA. server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 15.498 15.474 15.195 66.547 0.599 1.040
> 33554432 15.729 15.636 15.758 65.192 0.214 2.037
> 16777216 15.656 15.481 15.724 65.557 0.430 4.097
>
> 10) client: default max_sectors_kb, 2MB RA. server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 13.480 14.125 13.648 74.497 1.466 1.164
> 33554432 13.584 13.518 14.272 74.293 1.806 2.322
> 16777216 13.511 13.585 13.552 75.576 0.170 4.723
>
> 11) client: 64 max_sectors_kb, 2MB. RA server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 13.356 13.079 13.488 76.960 0.991 1.203
> 33554432 13.713 13.038 13.030 77.268 1.834 2.415
> 16777216 13.895 13.032 13.128 76.758 2.178 4.797
>
> With two threads:
> 5) client: default, server: default
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 12.661 12.773 13.654 78.681 2.622 1.229
> 33554432 12.709 12.693 12.459 81.145 0.738 2.536
> 16777216 12.657 14.055 13.237 77.038 3.292 4.815
>
> 6) client: default, server: 64 max_sectors_kb, RA default
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 13.300 12.877 13.705 77.078 1.964 1.204
> 33554432 13.025 14.404 12.833 76.501 3.855 2.391
> 16777216 13.172 13.220 12.997 77.995 0.570 4.875
>
> 7) client: default, server: default max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 13.365 13.168 12.835 78.053 1.308 1.220
> 33554432 13.518 13.122 13.366 76.799 0.942 2.400
> 16777216 13.177 13.146 13.839 76.534 1.797 4.783
>
> 8) client: default, server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 14.308 12.669 13.520 76.045 3.788 1.188
> 33554432 12.586 12.897 13.221 79.405 1.596 2.481
> 16777216 13.766 12.583 14.176 76.001 3.903 4.750
>
> 9) client: 64 max_sectors_kb, default RA. server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 14.454 12.537 15.058 73.509 5.893 1.149
> 33554432 15.871 14.201 13.846 70.194 4.083 2.194
> 16777216 14.721 13.346 14.434 72.410 3.104 4.526
>
> 10) client: default max_sectors_kb, 2MB RA. server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 13.262 13.308 13.416 76.828 0.371 1.200
> 33554432 13.915 13.182 13.065 76.551 2.114 2.392
> 16777216 13.223 14.133 13.317 75.596 2.232 4.725
>
> 11) client: 64 max_sectors_kb, 2MB. RA server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 18.277 17.743 17.534 57.380 0.997 0.897
> 33554432 18.018 17.728 17.343 57.879 0.907 1.809
> 16777216 17.600 18.466 17.645 57.223 1.253 3.576
>
> With five threads:
> 5) client: default, server: default
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 12.915 13.643 12.572 78.598 2.654 1.228
> 33554432 12.716 12.970 13.283 78.858 1.403 2.464
> 16777216 14.372 13.282 13.122 75.461 3.002 4.716
>
> 6) client: default, server: 64 max_sectors_kb, RA default
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 13.372 13.205 12.468 78.750 2.421 1.230
> 33554432 13.489 13.352 12.883 77.363 1.533 2.418
> 16777216 13.127 12.653 14.252 76.928 3.785 4.808
>
> 7) client: default, server: default max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 13.135 13.031 13.824 76.872 1.994 1.201
> 33554432 13.079 13.590 13.730 76.076 1.600 2.377
> 16777216 12.707 12.951 13.805 77.942 2.735 4.871
>
> 8) client: default, server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 13.030 12.947 13.538 77.772 1.524 1.215
> 33554432 12.826 12.973 13.805 77.649 2.482 2.427
> 16777216 12.751 13.007 12.986 79.295 0.718 4.956
>
> 9) client: 64 max_sectors_kb, default RA. server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 13.236 13.349 13.833 76.034 1.445 1.188
> 33554432 13.481 14.259 13.582 74.389 1.836 2.325
> 16777216 14.394 13.922 13.943 72.712 1.111 4.545
>
> 10) client: default max_sectors_kb, 2MB RA. server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 18.245 18.690 17.342 56.654 1.779 0.885
> 33554432 17.744 18.122 17.577 57.492 0.731 1.797
> 16777216 18.280 18.564 17.846 56.186 0.914 3.512
>
> 11) client: 64 max_sectors_kb, 2MB. RA server: 64 max_sectors_kb, RA 2MB
> blocksize R R R R(avg, R(std R
> (bytes) (s) (s) (s) MB/s) ,MB/s) (IOPS)
> 67108864 15.241 16.894 15.853 64.131 2.705 1.002
> 33554432 14.858 16.904 15.588 65.064 3.435 2.033
> 16777216 16.777 15.939 15.034 64.465 2.893 4.029
Hmm, it's really weird, why the case of 2 threads is faster. There must
be some commands reordering somewhere in SCST, which I'm missing, like
list_add() instead of list_add_tail().
Can you apply the attached patch and repeat tests 5, 8 and 11 with 1 and
2 threads, please. The patch will enable forced commands order
protection, i.e. with it all the commands will be executed in exactly
the same order as they were received.
Thanks,
Vlad
View attachment "forced_order.diff" of type "text/x-patch" (748 bytes)
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