patch (Re: ^Z during port build and hang?)

[Joerg Sonnenberger]

On Sat, Jun 25, 2005 at 11:13:20AM -0700, Matthew Dillon wrote:
> 
> :
> :On Sat, Jun 25, 2005 at 10:27:11AM +0200, Jeroen Ruigrok/asmodai wrote:
> :> -On [20050625 03:31], Hiten Pandya (hmp at xxxxxxxxxxxxx) wrote:
> :> >	If such is the case, this might solve the so-called interactivity
> :> >	issues that Asmodai and others pointed out when one is doing a
> :> >	buildworld and using X at thes same time ? (interactivity issues)
> :> 
> :> Disregard X here.  This happens just doing playing mp3's and 1 or 2 make
> :> processes in console as well.
> :
> :I think that's a cache issue somewhere. I get when I play a mp3 via madplay
> :and run a grep over src/sys/dev/netif (twice, the first time is fine).
> :
> :Joerg
> 
>     Sounds like a scheduling issue.  When the grep has to access I/O it
>     blocks and madplay gets enough cpu.  When the grep only goes to the
>     cache it doesn't block and madplay doesn't get enough.

Yeah, but given that madplay needs about 5% CPU time, that's rediculous.
Well, I'll try again with a new kernel.

Joerg