Re: 2.4.17 absurd number of context switches

[Alan Cox]

> Check out those figures for context switches!  30,000 switches per second
> with only three runnable processes and practically no block I/O seems
> quite high to me.  You can also see that the system is spending half its
..
> Is this a scheduler worst-case, something to be expected, or something I
> can work around?

The scheduler is _good_ at the three process case. Run some straces it looks
more like postgres is doing wacky yield based locks.

Alan