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Re: mkfs options for a 16x hw raid5 and xfs (mostly large files)

To: Ralf Gross <Ralf-Lists@xxxxxxxxxxxx>
Subject: Re: mkfs options for a 16x hw raid5 and xfs (mostly large files)
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Wed, 26 Sep 2007 05:52:39 -0400 (EDT)
Cc: linux-xfs@xxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx
In-reply-to: <20070926084924.GB30287@p15145560.pureserver.info>
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On Wed, 26 Sep 2007, Ralf Gross wrote:

Justin Piszcz schrieb:
What was the command line you used for that output?
tiobench.. ?

tiobench --numruns 3 --threads 1 --threads 2 --block 4096 --size 20000

--size 20000 because the server has 16 GB RAM.

Ralf



Here is my output on my SW RAID5 keep in mind it is currently being used so the numbers are a little slower than they probably should be:

My machine only has 8 GiB of memory but I used the same command you did:

This is with the 2.6.22.6 kernel, the 2.6.23-rcX/final when released is 
supposed to have the SW RAID5 accelerator code, correct?

Unit information
================
File size = megabytes
Blk Size  = bytes
Rate      = megabytes per second
CPU%      = percentage of CPU used during the test
Latency   = milliseconds
Lat%      = percent of requests that took longer than X seconds
CPU Eff   = Rate divided by CPU% - throughput per cpu load

Sequential Reads
                              File  Blk   Num                   Avg      
Maximum      Lat%     Lat%    CPU
Identifier                    Size  Size  Thr   Rate  (CPU%)  Latency    Latency      
>2s      >10s    Eff
---------------------------- ------ ----- ---  ------ ------ --------- 
-----------  -------- -------- -----
2.6.22.6                     20000  4096    1  523.01 45.79%     0.022      
510.77   0.00000  0.00000  1142
2.6.22.6                     20000  4096    2  501.29 85.84%     0.046      
855.59   0.00000  0.00000   584

Random Reads
                              File  Blk   Num                   Avg      
Maximum      Lat%     Lat%    CPU
Identifier                    Size  Size  Thr   Rate  (CPU%)  Latency    Latency      
>2s      >10s    Eff
---------------------------- ------ ----- ---  ------ ------ --------- 
-----------  -------- -------- -----
2.6.22.6                     20000  4096    1    0.90 0.276%    13.003       
74.41   0.00000  0.00000   326
2.6.22.6                     20000  4096    2    1.61 1.167%    14.443      
126.43   0.00000  0.00000   137

Sequential Writes
                              File  Blk   Num                   Avg      
Maximum      Lat%     Lat%    CPU
Identifier                    Size  Size  Thr   Rate  (CPU%)  Latency    Latency      
>2s      >10s    Eff
---------------------------- ------ ----- ---  ------ ------ --------- 
-----------  -------- -------- -----
2.6.22.6                     20000  4096    1  363.46 75.72%     0.030     
2757.45   0.00000  0.00000   480
2.6.22.6                     20000  4096    2  394.45 287.9%     0.056     
2798.92   0.00000  0.00000   137

Random Writes
                              File  Blk   Num                   Avg      
Maximum      Lat%     Lat%    CPU
Identifier                    Size  Size  Thr   Rate  (CPU%)  Latency    Latency      
>2s      >10s    Eff
---------------------------- ------ ----- ---  ------ ------ --------- 
-----------  -------- -------- -----
2.6.22.6                     20000  4096    1    3.16 1.752%     0.011        
1.02   0.00000  0.00000   180
2.6.22.6                     20000  4096    2    3.07 3.769%     0.013        
0.10   0.00000  0.00000    82




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