Re: HighPoint 374

["Svetoslav Slavtchev" <svetljo@gmx.de>]

> 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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