Re: HighPoint 374

["Svetoslav Slavtchev" <svetljo@gmx.de>]

> 
> 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! +++