On 3/15/06, Mrugesh Karnik <mrugeshkarnik(a)gmail.com> wrote:
Anyway, now I'm wondering how much effect an I/O
Scheduler will have on
drive performance, as compared to hdparm settings.
'hdparm -tT' gives me a read speed of ~55MB/s on my AMD Sempron64 2500+
system. My hard disk isn't even SATA. I don't think it is possible to
out much more. I suppose switching I/O Schedulers on
my system won't make
much of a difference.
Does anyone have more information about this?
u could do a dd if=/dev/zero of=<filename> and write large gb files...
experiment with bs and count tht will give u files of larger sizes.. wht we
found was deadline performed better when it came to io writes, we were doing
it on sata , optereon 246 (dual) server.
best way would be when entereing ur kernel after lilo or grub type in this..
"elevator=deadline" and then keep changind from deadline to cfqor
anticipatory. and do io writes ,
u could do a #date && dd if=/dev/zero of=tmp bs=64K count=16 && date
so the differnce in time would give u approx io time... also u could use sar
or vmstat to get brief ideas on read write.
"He who fights monsters should look to it that he himself does not become
one." - Friedrich Nietzche