Sorry My mistake. I will take care of it now onwards regards Ravish On Sat, Jun 20, 2009 at 8:26 PM, Alan Stern<stern@xxxxxxxxxxxxxxxxxxx> wrote: > You should use Reply-To-All so that other people reading the mailing > list will be able to follow and contribute to the thread. > > On Sat, 20 Jun 2009, Ravish Tayal wrote: > >> Thanks Alan, >> >> I am actually trying to profile the time taken by each layer to complete the >> disk write opertaion as sys_write to queue_command invokation veries alot. > > Of course it varies. The kernel buffers disk writes, shuffles them > around, and then carries them out when it wants to. As James has > pointed out, your write(2) system calls don't directly cause any I/O to > take place. > > Alan Stern > > > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
