SMP on quad xeons

[Steven Hartland]

My experience with the current SMP kernel is it works very well
on a 4 CPU opteron. That was 5.x-CURRENT a few months back
at that point the new ULE scheduler was unusable as in it caused
major delays in processing server apps. switched back to the
old BSD one and all was good. Not sure it these issues have
been fixed recently ( I hope so ).

    Steve
----- Original Message ----- 
From: "Erich Dollansky" <oceanare at pacific.net.sg>
> jromero at save-ferris.com wrote:
>> Posted to freebsd-smp but didn't get too many replies, so I apologize for
> 
> I am on that list too but I can't remember your posting.
> 
>> cross posting ahead of time.  Need to configure groupware server and
>> multiprotocol wireless proxy for aproximatly 2500 accounts. Application
>> is heavily multi threaded and willrequire alot of CPU power. The OS will
>> be FreeBSD 5.x Thinking of going with ServerWorks* Grand Champion HE quad
>> xeon server board. Has anyone had any SMP experience with quad xeon
> 
> I read on the list several times that FreeBSD has problems when 6 or 
> more CPUs are in a box. You could be affected by this if HTT is enabled.
> 
> There is currently a lot of development around the new scheduler (ULE) 
> which will be usable very soon. Check the mailing list to find out more.
> 
> Another thing. Did you consider Opterons? Tyan has a board with four of 
> them. You would not be affected by the 6-8 CPU 'problem'.
> 
>> systems on freebsd 5.x???  I'm curious to know if anyone experienced
>> any major technical stumbling blocks. I guess I also want to know how
>> well Freebsd 5.x will scale on a 4 proc. Will freeBSD 5.x utilize
>> a quad xeon board as efficiently as linux2.6 system ??
>> 
> I cannot tell as I never used Linux.
> 
> I run FreeBSD on a Dual-Athlon with the old scheduler (BSD). My 
> experience is that this scheduler is not as good as the one you find on 
> Solaris or HP-UX. This is also the reason why the new one was developed.


================================================
This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. 

In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137
or return the E.mail to postmaster at multiplay.co.uk.