linux-kernel - Re: [PATCH -next RFC v3 0/8] improve tag allocation under heavy load

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Date:   Mon, 25 Apr 2022 15:28:03 +0800
From:   "yukuai (C)" <yukuai3@...wei.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        <axboe@...nel.dk>, <bvanassche@....org>,
        <andriy.shevchenko@...ux.intel.com>, <john.garry@...wei.com>,
        <ming.lei@...hat.com>, <qiulaibin@...wei.com>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yi.zhang@...wei.com>
Subject: Re: [PATCH -next RFC v3 0/8] improve tag allocation under heavy load

在 2022/04/25 15:06, Damien Le Moal 写道:

>>> By the way, did you check that doing something like:
>>>
>>> echo 2048 > /sys/block/sdX/queue/nr_requests
>>>
>>> improves performance for your high number of jobs test case ?
>>
>> Yes, performance will not degrade when numjobs is not greater than 256
>> in this case.
> 
> That is my thinking as well. I am asking if did check that (did you run it ?).

Hi,

I'm sure I ran it with 256 jobs before.

However, I didn't run it with 512 jobs. And following is the result I
just tested:

ratio of sequential io: 49.1%

Read|Write seek 

cnt 99338, zero cnt 48753 

     >=(KB) .. <(KB)     : count       ratio |distribution 
              |
          0 .. 1         : 48753       49.1% 
|########################################|
          1 .. 2         : 0            0.0% | 
              |
          2 .. 4         : 0            0.0% | 
              |
          4 .. 8         : 0            0.0% | 
              |
          8 .. 16        : 0            0.0% | 
              |
         16 .. 32        : 0            0.0% | 
              |
         32 .. 64        : 0            0.0% | 
              |
         64 .. 128       : 4975         5.0% |##### 
              |
        128 .. 256       : 4439         4.5% |#### 
              |
        256 .. 512       : 2615         2.6% |### 
              |
        512 .. 1024      : 967          1.0% |# 
              |
       1024 .. 2048      : 213          0.2% |# 
              |
       2048 .. 4096      : 375          0.4% |# 
              |
       4096 .. 8192      : 723          0.7% |# 
              |
       8192 .. 16384     : 1436         1.4% |## 
              |
      16384 .. 32768     : 2626         2.6% |### 
              |
      32768 .. 65536     : 4197         4.2% |#### 
              |
      65536 .. 131072    : 6431         6.5% |###### 
              |
     131072 .. 262144    : 7590         7.6% |####### 
              |
     262144 .. 524288    : 6433         6.5% |###### 
              |
     524288 .. 1048576   : 4583         4.6% |#### 
              |
    1048576 .. 2097152   : 2237         2.3% |## 
              |
    2097152 .. 4194304   : 489          0.5% |# 
              |
    4194304 .. 8388608   : 83           0.1% |# 
              |
    8388608 .. 16777216  : 36           0.0% |# 
              |
   16777216 .. 33554432  : 0            0.0% | 
              |
   33554432 .. 67108864  : 0            0.0% | 
              |
   67108864 .. 134217728 : 137          0.1% |# 
              |