was Re: [PATCH] poll/select fast path
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The patch should apply & works for me on 2.4 too, no need to use 2.5 (select/poll are virtually unchanged between 2.4 and 2.5)
Running lmbench on quad xeon with Andi's patch shows a reduction in select latency in all cases compared to -pre10.
File select - times in microseconds - smaller is better Average of 25 runs. -ak-axboe is select/poll patch + blockhighmem.
select select select select select select select select kernel 10 fd 100 fd 250 fd 500 fd 10 TCP 100TCP 250TCP 500TCP --------------------- ------ ------ ------ ------ ------ ------ ------ ------ 2.4.19-pre10 4.73 30.66 74.62 143.77 5.67 40.879 97.914 193.10 2.4.19-pre10-ak-axboe 3.85 27.83 71.55 142.78 4.86 37.517 94.205 191.54 2.4.19-pre10-aa4 4.54 29.48 73.96 147.52 5.60 39.485 98.895 194.58 2.4.19-pre10-ac2 4.63 29.60 73.33 141.86 5.64 39.328 98.898 192.82
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Randy Hron http://home.earthlink.net/~rwhron/bigbox.html