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    SubjectRe: kernbench on 512p
    Date
    On Thursday, August 19, 2004 5:11 pm, Jesse Barnes wrote:
    > The output is attached (my mailer insists on wrapping it if I inline it).
    > I used 'lockstat -w'.

    The highlights:

    nw spin rjct lock & function
    19.0% 81.0% 0% dcache_lock
    3.3% 96.7% 0% d_alloc+0x270
    2.7% 97.3% 0% d_delete+0x40
    18.3% 81.7% 0% d_instantiate+0x90
    4.7% 95.3% 0% d_move+0x60
    34.6% 65.4% 0% d_rehash+0xe0
    19.1% 80.9% 0% dput+0x40
    10.5% 89.5% 0% link_path_walk+0xef0
    0% 100% 0% sys_getcwd+0x210

    41.4% 58.6% 0% rcu_state
    61.3% 38.7% 0% __rcu_process_callbacks+0x260
    41.4% 58.6% 0% rcu_check_quiescent_state+0xf0

    So it looks like the dcache lock is the biggest problem on this system with
    this load. And although the rcu stuff has improved tremendously for this
    system, it's still highly contended.

    Jesse
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