Re: [blk-lib] 6a0608544e5: fileio -77.4% max latency, -5.7% throughput

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On Tue, Mar 04, 2014 at 09:21:30PM +0800, Fengguang Wu wrote:
> Hi Kent,
> 
> FYI, we noticed the below changes on
> 
> git://evilpiepirate.org/~kent/linux-bcache.git for-jens
> commit 6a0608544e5672bd9a044c285119547eae41abe5 ("blk-lib.c: generic_make_request() handles large bios now")
> 
> test case: snb-drag/sysbench/fileio/600s-100%-1HDD-ext4-64G-1024-seqrewr-sync

I'm trying to figure out how to parse this and the graphs - where do I find the
test? And is there anything you can point me to for the graphs, or is that
output from that test?

> 
> 11541d5f5b7002b  6a0608544e5672bd9a044c285  
> ---------------  -------------------------  
>       1885 ~60%     -77.4%        426 ~ 7%  TOTAL fileio.request_latency_max_ms
>       6258 ~ 0%      -5.7%       5904 ~ 0%  TOTAL fileio.requests_per_sec
>         26 ~ 1%    +702.3%        211 ~ 8%  TOTAL slabinfo.kmalloc-4096.num_slabs
>        217 ~ 1%    +682.3%       1697 ~ 8%  TOTAL slabinfo.kmalloc-4096.num_objs
>         26 ~ 1%    +702.3%        211 ~ 8%  TOTAL slabinfo.kmalloc-4096.active_slabs
>        211 ~ 2%    +701.5%       1697 ~ 8%  TOTAL slabinfo.kmalloc-4096.active_objs
>          2 ~ 0%     -50.0%          1 ~ 0%  TOTAL vmstat.procs.b
>       2236 ~ 0%     +63.6%       3659 ~ 3%  TOTAL slabinfo.kmalloc-256.num_objs
>       2217 ~ 0%     +63.4%       3623 ~ 3%  TOTAL slabinfo.kmalloc-256.active_objs
>       3274 ~ 1%     +47.8%       4837 ~ 2%  TOTAL proc-vmstat.nr_slab_unreclaimable
>      13096 ~ 1%     +47.7%      19350 ~ 2%  TOTAL meminfo.SUnreclaim
>   62558204 ~ 5%     -30.7%   43379766 ~ 1%  TOTAL cpuidle.C3-SNB.time
>      91031 ~ 4%     -29.4%      64253 ~ 2%  TOTAL cpuidle.C1E-SNB.usage
>      34092 ~ 2%     -17.6%      28085 ~ 1%  TOTAL cpuidle.C3-SNB.usage
>       2656 ~ 2%     -15.0%       2258 ~ 2%  TOTAL proc-vmstat.kswapd_high_wmark_hit_quickly
>     266339 ~ 2%     +14.2%     304129 ~ 0%  TOTAL cpuidle.C6-SNB.usage
>      21899 ~ 2%      +9.6%      23992 ~ 2%  TOTAL interrupts.RES
>         20 ~ 0%      -8.0%         18 ~ 2%  TOTAL time.percent_of_cpu_this_job_got
>    3430189 ~ 0%      -5.9%    3226430 ~ 0%  TOTAL time.voluntary_context_switches
>        117 ~ 0%      -6.0%        110 ~ 0%  TOTAL time.system_time
>      11691 ~ 0%      -5.6%      11042 ~ 0%  TOTAL vmstat.system.cs
>        711 ~ 0%      +4.4%        742 ~ 0%  TOTAL iostat.sda.await
>        712 ~ 0%      +4.4%        743 ~ 0%  TOTAL iostat.sda.w_await
>      99142 ~ 0%      -2.2%      96963 ~ 0%  TOTAL iostat.sda.wkB/s
>      99257 ~ 0%      -2.2%      97110 ~ 0%  TOTAL vmstat.io.bo
>        139 ~ 0%      +1.7%        141 ~ 0%  TOTAL iostat.sda.avgqu-sz
> 
> 
> 
>                                fileio.requests_per_sec
> 
>    6300 ++----------------------------------------------------------*-------+
>    6250 *+.*..  .*.*..*..*..*..*..*.*..*..*..*..*..*.*..*..*..*..*.   *..*..*
>         |     *.                                                            |
>    6200 ++                                                                  |
>    6150 ++                                                                  |
>         |                                                                   |
>    6100 ++                                                                  |
>    6050 ++                                                                  |
>    6000 ++                        O                                         |
>         |     O                                            O                |
>    5950 O+ O                                         O                      |
>    5900 ++       O    O  O     O                              O             |
>         |          O        O       O  O     O     O                        |
>    5850 ++                                O     O       O                   |
>    5800 ++------------------------------------------------------------------+
> 
> 
>                             fileio.request_latency_max_ms
> 
>    4500 ++------------------------------------------------------------------+
>         |                                                             *     |
>    4000 ++                                                            :     |
>    3500 ++                                                            ::    |
>         |                                                            : :    |
>    3000 ++                                   *                       : :    |
>    2500 ++                             *..  + :    *                 :  :   |
>         |                             +    +   :  + :                :  :   |
>    2000 ++        .*..               +    *    : +  :                :  :   |
>    1500 ++       *    *..   *..    .*           *    : .*..*..*..*..:    : .*
>         *..    ..         ..     .*                  *.             :    *. |
>    1000 ++   .*          *     *.                                   *       |
>     500 ++ *.         O                                                     |
>         O  O  O  O O     O  O  O  O O  O  O  O  O  O O  O  O  O             |
>       0 ++------------------------------------------------------------------+
> 
> 
> 
> Thanks,
> Fengguang
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