> The previous mail got scrambbled and hence I am resending this one
> again
>
Still. Here are the values, fit for 80 cols.
Latency (seconds)
CFQ CSCAN
seq reads 0.0116 0.0148
seq writes 0.0164 0.0092
seq r+w 0.0107 0.0169
rnd reads 0.1178 0.1043
rnd writes 0.0423 0.0473
rnd r+w 0.0605 0.0732
Throughput MB/sec
CFQ CSCAN
seq reads 19.062 14.553
seq writes 15.251 22.108
seq r+w 22.127 14.72
rnd reads 2.1197 2.394
rnd writes 1.0032 0.9304
rnd r+w 1.376 1.399
Excels at sequential writes, so it seems like a good idea to use CSCAN on a
target drive when doing `rsync disk1/ disk2/`, esp. for large
files.
Jan Engelhardt
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