On Tue, Apr 02, 2013 at 07:21:24PM +0000, Rohan Sharma wrote: > Actually I have enabled debug on server side(that should not make any difference). Your results clearly show that io size increases but its not happening in my case. > > Which kernel version are you using, I am on 2.6.34?. Could that be a problem? I ran this particular test on 3.8.4-202.fc18.x86_64. Are you running the stock nbd-server btw? -- Michal Belczyk Sr.