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Date: Sat, 31 Jan 2004 19:34:55 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
To: jeff@FreeBSD.org
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Subject: Re: cvs commit: src/sys/kern sched_4bsd.c
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On 31 Jan, Jeff Roberson wrote:
> jeff        2004/01/31 18:46:47 PST
> 
>   FreeBSD src repository
> 
>   Modified files:
>     sys/kern             sched_4bsd.c 
>   Log:
>    - Keep a variable 'sched_tdcnt' that is used for the local implementation
>      of sched_load().  This variable tracks the number of running and runnable
>      non ithd threads.  This removes the need to traverse the proc table and
>      discover how many threads are runnable.

I was suprised to find that processes in disk wait are no longer counted
towards the load average.  This happened in rev 1.163 of kern_synch.c,
which  was committed more than two years ago.

Even if CPU time is available, a machine with a lot of processes stuck
in disk wait is going to feel slow ...