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    SubjectRe: [patch 1/21] random fixes
    On Sun, Aug 11, 2002 at 12:38:19AM -0700, Andrew Morton wrote:
    > Sorry, but there's a ton of stuff here. It ends up as a 4600 line
    > diff. Some code dating back to 2.5.24. It's almost all performance
    > work and it has been very painful getting its effectiveness tested
    > on the big machines; the main problem has been getting them booting
    > 2.5 at all. The results still are not as conclusive as I'd like,
    > but the signs are good, and there are no other proposals around to
    > fix these problems.

    dbench 256 on a 16x/16G numaq:

    Throughput 50.7526 MB/sec (NB=63.4408 MB/sec 507.526 MBit/sec) 256 procs


    c013bf74 13251607 72.928 .text.lock.highmem
    c013b7d0 1606972 8.84371 kunmap_high
    c013b5dc 1211097 6.66507 kmap_high
    c012f260 459420 2.52834 generic_file_write
    c0114820 166854 0.918253 scheduler_tick
    c012e53c 166773 0.917808 file_read_actor
    c0105394 125561 0.691004 default_idle
    c013bcbc 75623 0.416179 blk_queue_bounce
    c013564c 72289 0.397831 rmqueue
    c01113b8 69062 0.380071 smp_apic_timer_interrupt
    c0143cec 64782 0.356517 block_prepare_write
    c014330c 53426 0.294021 __block_prepare_write
    c0142ee8 39892 0.219539 create_empty_buffers
    c012dec0 39161 0.215516 unlock_page
    c01143d8 38648 0.212693 load_balance
    c013b558 34840 0.191736 flush_all_zero_pkmaps
    c0135d28 33414 0.183888 page_cache_release
    c013429c 22753 0.125217 lru_cache_add
    c0135b10 20326 0.111861 __alloc_pages
    c0143d98 19833 0.109148 generic_commit_write
    c012dcb4 18150 0.0998855 add_to_page_cache
    c0140044 17758 0.0977282 vfs_write
    -
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