Re: HighPoint 374

["Tomi Orava" <Tomi.Orava@ncircle.nullnet.fi>]

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]#
>
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-- 
Tomi.Orava@ncircle.nullnet.fi