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
--
Success is mainly about failing a lot.
-
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