[nptl] Re: SCHED_RR issue

["Loic Domaigne" <loic-dev@gmx.net>]

Hello Sebastien, 

What a list! 

I am *jealous* that you might access so much cool systems... 
Really! 

> (*) 8x IA32 (Xeon); Linux kernel 2.6.6-1.406smp; FC2
> -> same result: with nthreads >= 8, we have some hangs (harder to
> reproduce than with 2x cpu)

Yes. I do not expect any problems so long you that start a number 
threads <= NCPU - 1. Because, in that case, there is always one free 
CPU to run the [i]cpu_thread[/i].
 

> (*) 2x IA32; Solaris 10:
>  -> Everything is OK ("test 1024 50" works fine)

Solaris 10 OK (with default libpthreads on Solaris 8, 
we would have to adapt the program to start SCS 
instead of PCS threads).


> (*) 4x PPC; Aix5.3:
>  -> Everything is OK
>  -> also tested on AIX5.2 but I got minprio = maxprio = -1.

Hum, hum, hum... How come? 

> (*) 4x IA64; Linux 2.6.7 Bull Advanced Server (based on RHAS)
>  -> Everything is OK.
> 
> (*) 2x IA64; Linux 2.4.21 RHEL 3 - U1
>  -> Everything is OK.
> 
> 
> So, it looks like the problem is either in FC2, or in IA32 kernels.

Interesting... 

> I should be able to test on the same IA32 box with a SuSe 9 distro,
> which I'm going to do now.

One question. Do you have installed NPTL by yourselves on SuSE v9.0
( IIRC they started to 'officially' ship NPTL with v9.1 ). 


So long, 
Loic. 

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