Messages in this thread | | | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: HighPoint 374 | Date | Mon, 20 Oct 2003 23:25:05 +0200 |
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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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