Messages in this thread |  | | | Date | Tue, 21 Oct 2003 21:43:41 +0300 (EEST) | | Subject | Re: HighPoint 374 | | From | "Tomi Orava" <> |
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Bartlomiej,
> multicount affects PIO transfers performance only...
This makes sense as I was finally able to run some tests and hdparm -m doesn't seem to affect anything.
However, do the following errors tell you anything new ? (They were seen while copying almost 40GB of files from one RAID1-mirror (hpt374) to second RAID1-mirror(
> > 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]# > > - > 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/ >
-- Tomi.Orava@ncircle.nullnet.fi - 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/
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