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    SubjectRe: 2.6.24-rc3-mm1 (sync is slow ?)
    On Wed, 21 Nov 2007 17:42:15 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

    > Hi, Andrew
    >
    > I got following result in 'sync' command.
    > It was too slow. (memory controller config is off ;)
    > I attaches my .config.
    > ==
    > [2.6.24-rc3-mm1]
    > [kamezawa@dr-test2 ~]$ dd if=/dev/zero of=./tmpfile bs=4096 count=100000
    > 100000+0 records in
    > 100000+0 records out
    > 409600000 bytes (410 MB) copied, 1.46706 seconds, 279 MB/s
    > [kamezawa@dr-test2 ~]$ time sync
    >
    > real 3m6.440s
    > user 0m0.000s
    > sys 0m0.133s
    >
    >
    > on, 2.6.23-rc2-mm1, 2.6.23-rc3 there was no problem.
    > ==
    > [2.6.24-rc3]
    > [kamezawa@dr-test2 ~]$ dd if=/dev/zero of=tmpfile bs=4096 count=100000
    > 100000+0 records in
    > 100000+0 records out
    > 409600000 bytes (410 MB) copied, 2.07717 seconds, 197 MB/s
    > [kamezawa@dr-test2 ~]$ time sync
    >
    > real 0m9.935s
    > user 0m0.001s
    > sys 0m0.113s
    >
    > [2.6.24-rc3]
    > [kamezawa@dr-test2 ~]$ dd if=/dev/zero of=./tmpfile bs=4096 count=100000
    > 100000+0 records in
    > 100000+0 records out
    > 409600000 bytes (410 MB) copied, 1.37147 seconds, 299 MB/s
    > [kamezawa@dr-test2 ~]$ time sync[2.6.24-rc2-mm1]
    >
    >
    > real 0m11.718s
    > user 0m0.000s
    > sys 0m0.138s

    Well I wonder how we did that.

    It seems OK here from a quick test (i386, ext3-on-IDE).

    Maybe device driver/block breakage?
    -
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