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    SubjectRe: [ltt-dev] [RFC PATCH] block: Fix bio merge induced high I/O latency
    > So, I ran the tests with my corrected patch, and the results are very
    > good !
    >
    > "incoming ssh connexion" test
    >
    > "config 2.6.28 cfq"
    > Linux 2.6.28
    > /sys/block/sd{a,b}/device/queue_depth = 31 (default)
    > /sys/block/sd{a,b}/queue/iosched/slice_async_rq = 2 (default)
    > /sys/block/sd{a,b}/queue/iosched/quantum = 4 (default)
    >
    > "config 2.6.28.1-patch1"
    > Linux 2.6.28.1
    > Corrected cfq patch applied
    > echo 1 > /sys/block/sd{a,b}/device/queue_depth
    > echo 1 > /sys/block/sd{a,b}/queue/iosched/slice_async_rq
    > echo 1 > /sys/block/sd{a,b}/queue/iosched/quantum
    >
    > On /dev/sda :
    >
    > I/O scheduler runt-min (msec) runt-max (msec)
    > cfq (2.6.28 cfq) 523 6637
    > cfq (2.6.28.1-patch1) 579 2082
    >
    > On raid1 :
    >
    > I/O scheduler runt-min (msec) runt-max (msec)
    > cfq (2.6.28 cfq) 523 28216
    > cfq (2.6.28.1-patch1) 517 3086

    Congraturation.
    In university machine room (at least, the university in japan),
    parallel ssh workload freqently happend.

    I like this patch :)



    >
    > It looks like we are getting somewhere :) Are there any specific
    > queue_depth, slice_async_rq, quantum variations you would like to be
    > tested ?
    >
    > For reference, I attach my ssh-like job file (again) to this mail.
    >
    > Mathieu
    >
    >
    > [job1]
    > rw=write
    > size=10240m
    > direct=0
    > blocksize=1024k
    >
    > [global]
    > rw=randread
    > size=2048k
    > filesize=30m
    > direct=0
    > bsrange=4k-44k
    >
    > [file1]
    > startdelay=0
    >
    > [file2]
    > startdelay=4
    >
    > [file3]
    > startdelay=8
    >
    > [file4]
    > startdelay=12
    >
    > [file5]
    > startdelay=16
    >
    > [file6]
    > startdelay=20
    >
    > [file7]
    > startdelay=24
    >
    > [file8]
    > startdelay=28
    >
    > [file9]
    > startdelay=32
    >
    > [file10]
    > startdelay=36
    >
    > [file11]
    > startdelay=40
    >
    > [file12]
    > startdelay=44
    >
    > [file13]
    > startdelay=48
    >
    > [file14]
    > startdelay=52
    >
    > [file15]
    > startdelay=56
    >
    > [file16]
    > startdelay=60
    >
    > [file17]
    > startdelay=64
    >
    > [file18]
    > startdelay=68
    >
    > [file19]
    > startdelay=72
    >
    > [file20]
    > startdelay=76
    >
    > [file21]
    > startdelay=80
    >
    > [file22]
    > startdelay=84
    >
    > [file23]
    > startdelay=88
    >
    > [file24]
    > startdelay=92
    >
    > [file25]
    > startdelay=96
    >
    > [file26]
    > startdelay=100
    >
    > [file27]
    > startdelay=104
    >
    > [file28]
    > startdelay=108
    >
    > [file29]
    > startdelay=112
    >
    > [file30]
    > startdelay=116
    >
    > [file31]
    > startdelay=120
    >
    > [file32]
    > startdelay=124
    >
    > [file33]
    > startdelay=128
    >
    > [file34]
    > startdelay=132
    >
    > [file35]
    > startdelay=134
    >
    > [file36]
    > startdelay=138
    >
    > [file37]
    > startdelay=142
    >
    > [file38]
    > startdelay=146
    >
    > [file39]
    > startdelay=150
    >
    > [file40]
    > startdelay=200
    >
    > [file41]
    > startdelay=260
    >
    > --
    > Mathieu Desnoyers
    > OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
    >
    > _______________________________________________
    > ltt-dev mailing list
    > ltt-dev@lists.casi.polymtl.ca
    > http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev





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