Re: CVS commit: src/sys/netinet

[David Laight <david%l8s.co.uk@localhost>]

On Wed, Aug 11, 2010 at 09:36:45AM +0000, Antti Kantee wrote:
> Module Name:  src
> Committed By: pooka
> Date:         Wed Aug 11 09:36:45 UTC 2010
> 
> Modified Files:
>       src/sys/netinet: ip_carp.c
> 
> Log Message:
> Use kpause() instead of DELAY() and sleep a minimum of 1 tick.
> This is possible now since softints have a thread context.  It's
> also not a very frequent code path.  Addresses ABI issue with delay
> (kern/40505).

1) How many copies of this function can actually run at the same time ?
2) How many kernel threads are available for softints ??
3) How many other places might kernel threads sleep for timeout ???

It might be that they will all get stuck!

Actually, although kernel worker threads can sleep, in general they
shouldn't do so unless they are just waiting for locks and similar
short duration sleeps.
I remember seeing solaris systems stuck when more than 1 (or a few)
drivers slept in the kernel threads.

        David

-- 
David Laight: david%l8s.co.uk@localhost