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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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