Messages in this thread | | | Date | Mon, 20 Oct 2003 23:07:40 +0200 (MEST) | From | "Svetoslav Slavtchev" <> | Subject | Re: HighPoint 374 |
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> 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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