Messages in this thread | | | Date | Mon, 10 Feb 2003 23:17:30 +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 03:48:08AM -0800, 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. >> > >NOTE: first there is no seek at all in the benchmark we're talking >about, no idea why you think there are seeks. This is not tiobench, this >is bonnie sequential read. > Yes, Andrew obviously missed this... Anyway, could it be due to a big stripe size and hitting more disks in the RAID? How does a single SCSI disk perform here, Andrea?
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