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    SubjectRe: HighPoint 374
    Date

    multicount affects PIO transfers performance only...

    On Monday 20 of October 2003 23:07, Svetoslav Slavtchev wrote:
    > > BTW, isn't m0 supposed to reduce perfomance?
    >
    > hm here it also doesn't seem to change much,
    > may be it's ignored if UDMA is used
    >
    > mem is 1024Mb
    >
    > [root@svetljo kernel]# hdparm -m0 /dev/hde
    >
    > /dev/hde:
    > setting multcount to 0
    > multcount = 0 (off)
    >
    > [root@svetljo 1]# time dd if=/dev/zero of=10Gb.zeros count=20000 bs=512k
    > 20000+0 records in
    > 20000+0 records out
    > 0.09user 29.38system 5:44.49elapsed 8%CPU (0avgtext+0avgdata 0maxresident)k
    > 0inputs+0outputs (149major+40minor)pagefaults 0swaps
    > [root@svetljo 1]# hdparm -m8 /dev/hde
    >
    > /dev/hde:
    > setting multcount to 8
    > multcount = 8 (on)
    > [root@svetljo 1]# time dd if=/dev/zero of=10Gb.zeros count=20000 bs=512k
    > 20000+0 records in
    > 20000+0 records out
    > 0.10user 28.99system 5:50.44elapsed 8%CPU (0avgtext+0avgdata 0maxresident)k
    > 0inputs+0outputs (150major+41minor)pagefaults 0swaps
    >
    > root@svetljo 1]# hdparm -m16 /dev/hde
    >
    > /dev/hde:
    > setting multcount to 16
    > multcount = 16 (on)
    > [root@svetljo 1]# time dd if=/dev/zero of=10Gb.zeros count=20000 bs=512k
    > 20000+0 records in
    > 20000+0 records out
    > 0.09user 28.83system 5:53.57elapsed 8%CPU (0avgtext+0avgdata 0maxresident)k
    > 0inputs+0outputs (165major+40minor)pagefaults 0swaps
    > [root@svetljo 1]#
    >
    > > [root@fulanito wd1200jb]# time dd if=/dev/zero of=filling count=20000
    > > bs=65536
    > > 20000+0 records in
    > > 20000+0 records out
    > >
    > > real 0m33.763s
    > > user 0m0.200s
    > > sys 0m10.920s
    > > [root@fulanito wd1200jb]# hdparm -m4 /dev/hdk
    > >
    > > /dev/hdk:
    > > setting multcount to 4
    > > multcount = 4 (on)
    > > [root@fulanito wd1200jb]# time dd if=/dev/zero of=filling count=20000
    > > bs=65536
    > > 20000+0 records in
    > > 20000+0 records out
    > >
    > > real 0m30.321s
    > > user 0m0.150s
    > > sys 0m10.630s
    > > [root@fulanito wd1200jb]# hdparm -m0 /dev/hdk
    > >
    > > /dev/hdk:
    > > setting multcount to 0
    > > multcount = 0 (off)
    > > [root@fulanito wd1200jb]# time dd if=/dev/zero of=filling count=20000
    > > bs=65536
    > > 20000+0 records in
    > > 20000+0 records out
    > >
    > > real 0m30.749s
    > > user 0m0.130s
    > > sys 0m10.900s
    > > [root@fulanito wd1200jb]#

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