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Subject[BENCHMARK] 52-mm1 patch-TIO bench- maximum I/O latency on rise.
Date
From
Hi,
Here are the results of comparison of kernel 2.5.52 with mm1 and 2.5.52 on TIObench. key findings.

-------------------------------------------------------------
test 2.5.52-mm1 (as compared to
2.5.52) APPRXIMATE % change
-------------------------------------------------------------
rate (megabytes per second) less than 2% increase
CPU % utilization less than 2% increase
Average Latency 3 to 4% increase
Maximum latency 20 % increase ( from 51 to 52 there was 15% increase)
CPU efficiency less than 5% increase
-------------------------------------------------------------
-------------------------------------------------------------
Linux kernel 2.5.52-mm1
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 8.75 5.008% 12.424 1947.51 0.00000 0.00000 175
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 0.781% 212.562 1357.99 0.00000 0.00000 65
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 16.79 31.59% 4.111 25844.57 0.06562 0.00156 53
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 0.73 0.979% 1.375 1629.45 0.00000 0.00000 75
regards,
Aniruddha Marathe
WIPRO Technologies, India
aniruddha.marathe@wipro.com
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