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List:       linux-kernel
Subject:    [BENCHMARK] not so good performance of 2.5.52 on TIO bench
From:       "Aniruddha M Marathe" <aniruddha.marathe () wipro ! com>
Date:       2002-12-16 6:56:35
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Hi,
Here are the results of comparison of kernel 2.5.51 and 2.5.52 on TIObench.
key findings. 

-------------------------------------------------------------
test					2.5.52 (as compared to
					2.5.51) APPRXIMATE % change
-------------------------------------------------------------
rate (megabytes per second)	5% decrease
CPU % utilization			5% decrease
Average Latency			less than 2% increase
Maximum latency			15 % increase		
CPU efficiency			less than 2% increase
-------------------------------------------------------------

-------------------------------------------------------------
			Linux kernel 2.5.52
			TIO bench results
			Date 16th december 2002
-------------------------------------------------------------
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
---------------------------- ------ ----- ---  ------ ------ --------- -----------  \
-------- -------- ----- 2.5.52                        252   4096   10    8.48 5.251%  \
12.152     1825.07   0.00000  0.00000   161

Random Reads
                              File  Blk   Num                   Avg      Maximum      \
Lat%     Lat%    CPU Identifier                    Size  Size  Thr   Rate  (CPU%)  \
                Latency    Latency      >2s      >10s    Eff
---------------------------- ------ ----- ---  ------ ------ --------- -----------  \
-------- -------- ----- 2.5.52                        252   4096   10    0.50 0.729%  \
211.130     1079.20   0.00000  0.00000    69

Sequential Writes
                              File  Blk   Num                   Avg      Maximum      \
Lat%     Lat%    CPU Identifier                    Size  Size  Thr   Rate  (CPU%)  \
                Latency    Latency      >2s      >10s    Eff
---------------------------- ------ ----- ---  ------ ------ --------- -----------  \
-------- -------- ----- 2.5.52                        252   4096   10   16.17 30.00%  \
4.525    29226.70   0.06094  0.00625    54

Random Writes
                              File  Blk   Num                   Avg      Maximum      \
Lat%     Lat%    CPU Identifier                    Size  Size  Thr   Rate  (CPU%)  \
                Latency    Latency      >2s      >10s    Eff
---------------------------- ------ ----- ---  ------ ------ --------- -----------  \
-------- -------- ----- 2.5.52                        252   4096   10    0.78 1.084%  \
0.675      992.39   0.00000  0.00000    72

regards,
Aniruddha Marathe
WIPRO Technologies, India
aniruddha.marathe@wipro.com
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