Messages in this thread | | | Date | Mon, 10 Feb 2003 23:14:45 +1100 | From | Nick Piggin <> | Subject | Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] |
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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.
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