Messages in this thread | | | Date | Fri, 9 Jun 2006 22:15:36 -0400 | From | "Vishal Patil" <> | Subject | CSCAN vs CFQ I/O scheduler benchmark results |
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The previous mail got scrambbled and hence I am resending this one again
Hello
I ran the sysbench benchmark to compare the CSCAN I/O scheduler against the CFQ scheduler and following are the results. The results are interesting especially in case of sequential writes and the random workloads
Latency (seconds)
seq seq seq rnd rnd rnd reads writes r + w reads writes r + w -------------------------------------------------------------------------------------- CFQ 0.0116 0.0164 0.0107 0.1178 0.0423 0.0605
CSCAN 0.0148 0.0092 0.0169 0.1043 0.0473 0.0732
Throughput (MB/seconds)
seq seq seq rnd rnd rnd reads writes r + w reads writes r + w
-------------------------------------------------------------------------------------- CFQ 19.062 15.251 22.127 2.1197 1.0032 1.376
CSCAN 14.553 22.108 14.72 2.394 0.9304 1.399
The machine configuation is as follows CPU: Intel(R) Pentium(R) 4 CPU 2.80GHz Memory: 1027500 KB (1 GB) Filesystem: ext3 Kernel: 2.6.16.2
If interseted you may have a look at the raw data at http://www.google.com/notebook/public/14554179817860061151/BDQtXSwoQ2_mdxLgh
- Vishal
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