libkse and SMP (was Re: USB bulk read & pthreads)

[Julian Elischer]

On Thu, 22 May 2003, Dan Nelson wrote:

> In the last episode (May 22), Terry Lambert said:
> > Make sure you use SCHED_4BSD, rather than SCHED_ULE, if you are using
> > one of the kernel threads libraries, for now.
> > 
> > You really should read the -current archives before attempting any of
> > this, if you don't follow -current closely enough to have caught
> > Jeff's message on this, or which kernel threading libraries are
> > available.
> 
> I do read -current, and I'm definitely not going anywhere near
> SCHED_ULE.  I just tested both libraries with today's kernel and
> libraries, and was able to get a hard lockup with both libthr and
> libkse.  Mysql seems to run okay.  Starting a threaded pike process
> seems to be the killer.  Unfortunately, pike's a pretty large app so
> it's not easy to get a stripped-down testcase.



Ok so we need to get a description of this 'lockup'.

1/ does teh whole system lock up?
2/ is this SMP?  (how many cpus)?
3/ does the system respond to pings?
4/ do you have teh kernel dbugger installed, and if you do, does it
respond on the console to <CTL><ALT><ESC>. You may have to start you
app from outside X11 on a console to be able to see the console once it
has frozen if it si an X app.
5/ if it DOES go into ddb, what does 'ps' show?
6/ got a serial console?



> 
> -- 
> 	Dan Nelson
> 	dnelson at allantgroup.com
>