Messages in this thread | | | Date | Mon, 10 Feb 2003 13:26:18 +0100 | From | Andrea Arcangeli <> | Subject | Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] |
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On Mon, Feb 10, 2003 at 11:14:45PM +1100, Nick Piggin wrote: > Andrea Arcangeli wrote: > > >On Mon, Feb 10, 2003 at 10:53:27PM +1100, Nick Piggin wrote: > > > >>Andrew Morton wrote: > >> > >> > >>>Andrea Arcangeli <andrea@suse.de> wrote: > >>> > >>> > >>>>It's the readahead in my tree that allows the reads to use the max scsi > >>>>command size. It has nothing to do with the max scsi command size > >>>>itself. > >>>> > >>>> > >>>Oh bah. > >>> > >>>- *max_ra++ = vm_max_readahead; > >>>+ *max_ra = ((128*4) >> (PAGE_SHIFT - 10)) - 1; > >>> > >>> > >>>Well of course that will get bigger bonnie numbers, for exactly the > >>>reasons > >>>I've explained. It will seek between files after every 512k rather than > >>>after every 128k. > >>> > >>> > >>Though Andrea did say it is a "single threaded" streaming read. > >> > > > >yes, I pointed you to bonnie read sequential in bigbox.html, not > >tiobench. > > > The same pattern is also observed with single threaded tiobench > anyway.
yes, of course.
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