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    SubjectRe: 2.[45] fixes for design locking bug in wait_on_page/wait_on_buffer/get_request_wait
    On Sat, Nov 16, 2002 at 06:43:36PM +0100, Marc-Christian Petersen wrote:
    > On Saturday 16 November 2002 18:32, Andrea Arcangeli wrote:
    >
    > Hi Andrea,
    >
    > > you may want to try with this setting that helps with very slow devices:
    > > echo 2 500 0 0 500 3000 3 1 0 > /proc/sys/vm/bdflush
    > >
    > > or also with my current default tuned for high performance:
    > > echo 50 500 0 0 500 3000 60 20 > /proc/sys/vm/bdflush
    > I've tested both without any changes, "pausings" are still there.
    >
    > > you may have too many dirty buffers around and you end running at disk
    > > speed at every memory allocation, the first setting will decrease the
    > > amount of dirty buffers dramatically, if you still have significant
    > > slowdown with the first setting above, it's most probably only the usual
    > > elevator issue.
    > Seems so.
    >
    > So I have to use 2.4.18 until there is a real proper fix for that.

    just to make a quick test, can you try an hack like this combined with a
    setting of elvtune -r 128 -w 256 on top of 2.4.20rc1?

    --- x/drivers/block/ll_rw_blk.c.~1~ Sat Nov 2 19:45:33 2002
    +++ x/drivers/block/ll_rw_blk.c Sat Nov 16 19:44:20 2002
    @@ -432,7 +432,7 @@ static void blk_init_free_list(request_q

    si_meminfo(&si);
    megs = si.totalram >> (20 - PAGE_SHIFT);
    - nr_requests = 128;
    + nr_requests = 16;
    if (megs < 32)
    nr_requests /= 2;
    blk_grow_request_list(q, nr_requests);


    Andrea
    -
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