On Fri, 2007-07-27 at 23:51 +0200, Indan Zupanci > > also, they take up seek time (5 to 10 msec), so if you were to read > > something else at the time you get additional latency. > > If there's other disk activity swap prefetch shouldn't do much, so this isn't > really true.
how do you know there will be other activity? You start the IO and that basically blacks out the disk for 5 to 10 ms. If the "real" IO gets submitted in that time you add latency. You cannot predict that IO happening or not happening. -- if you want to mail me at work (you don't), use arjan (at) linux.intel.com Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/