lkml.org 
[lkml]   [2003]   [Oct]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: HighPoint 374
    > 
    > multicount affects PIO transfers performance only...

    how could it then " resolve" DMA timeouts ?

    > 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]#
    >

    --
    NEU FÜR ALLE - GMX MediaCenter - für Fotos, Musik, Dateien...
    Fotoalbum, File Sharing, MMS, Multimedia-Gruß, GMX FotoService

    Jetzt kostenlos anmelden unter http://www.gmx.net

    +++ GMX - die erste Adresse für Mail, Message, More! +++

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:58    [W:0.028 / U:2.512 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site