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    SubjectRe: Absolutely horrid IDE performance...
    Gerard Roudier wrote:
    >
    > On Wed, 2 Dec 1998, Mark Lord wrote:
    >
    > > > -------Sequential Output-------- ---Sequential Input-- --Random--
    > > > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
    > > >Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec
    > > >%CPU
    > > > 256 17374 95.5 32681 33.2 10706 24.3 15683 68.4 23710 24.3 214.6 1.8
    >
    > Just my comments on this benchmark results:
    >
    > 1) Block write = 32681 KB/second
    > Comment: Not relevant, if as I guess the machine has probably 128 MB
    > memory.

    Yes, but the same results are achievable on less.
    The test file was 256MB. Those are *real* throughput rates,
    not buffer-cache buggered speeds.

    > 2) Block read 23710 KB/second against Character Read 15683 KB/s
    > and only 68.4 % CPU.
    > Comment: You should get at least 90 %. Something is behaving not well
    > somewhere.

    Why should it get 90%? The machine is very fast, and has to wait
    sometimes for I/O. Again, no bogosity there.
    >
    > For your information, here is a benchmark result with Linux 2.1.30 and the
    > stock driver I got a couple of days ago using a single Cheatah2.
    > (PII 233 / 66MHz SDRAM + 64MB + SYM53C895)
    >
    > -------Sequential Output-------- ---Sequential Input-- --Random--
    > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
    > Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
    > 4K ext2 300 10656 97.7 19235 23.7 8346 26.5 13097 91.8 18602 21.0 229.2 4.7

    Looks pretty wimpy, even by IDE standards.
    --
    mlord@pobox.com

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