On 3/15/06, Mrugesh Karnik mrugeshkarnik@gmail.com wrote:

Anyway, now I'm wondering how much effect an I/O Scheduler will have on

the

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

squeeze

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?

Mrugesh

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