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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]#
>

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