Re: system call performance 4.x vs 5.x [and UP vs MP]

From: Colin Percival <colin.percival_at_wadham.ox.ac.uk>
Date: Wed, 28 Jan 2004 17:36:21 +0000
At 17:20 28/01/2004, Don Bowman wrote:
>For example, on a 2.0GHz P4-Xeon, HTT enabled, MP kernel, i can
>do ~1M socket/s calls on 4.7, but only ~250K/s on 5.2.
>
>      syscall      4.7        5.2
>        write  1015036     169800
>       socket  1078994     223253
>       select   430564     155077
>gettimeofday   252762     183620
>
>Any suggestion on why such a difference between 4.x and 5.x?

   Mutexes are slow.  The SMP changes in 5.x result in much
better scaling, but there is some inevitable overhead cost.

Colin Percival
Received on Wed Jan 28 2004 - 08:36:41 UTC

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