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    SubjectRe: CSCAN vs CFQ I/O scheduler benchmark results

    > 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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