Advices regarding hdparm multcount option
My Gygabyte motherboard (SB700 with AMD4400+) has poor SATA
performance. Any disk I/O leads to high system CPU percentage.
And the AHCI interrupt is about 1000/s even for low disk usage.
Using hdparm, I've found that all my sata disks have multcount set to 0:
$ sudo hdparm /dev/sdb
multcount = 0 (off)
IO_support = 0 (default)
readonly = 0 (off)
readahead = 256 (on)
geometry = 38913/255/63, sectors = 625142448, start = 0
As far as I can tell, I should get better performance by setting
mulcount to 8 or 16. (ie. hdparm -m 16 /dev/sdb)
But, hdparm warns that -m is a dangerous option.
What is your opinion on this ? Is this really dangerous ? Or is it only
when playing with too high mulcount value ?
All the best
"Delivering successful solutions requires giving people what they
need, not what they want." Kurt Bittner
domidumont at irc.freenode.net
ddumont at irc.debian.org