Re: Current vanilla kernel state

Dear all

Yes it was really the scheduler that I meant - sorry for the confusion.

The obvious problem is the the non-HT aware scheduler does not realise the
shared memory etc issues of having two processors on the same chip and
therefore cannot optimise the load across the 2x2 processors.

I believe this has been ported to the RH latest kernels but I wanted to
know about the vanilla kernels since the RH versions are quite divergent.

It is all about knowing when to jump in and not waste time doing something
that is about to be released!

John

John Logsdon                               "Try to make things as simple
Quantex Research Ltd, Manchester UK         as possible but not simpler"
j.logsdon <at> quantex-research.com              a.einstein <at> relativity.org
+44(0)161 445 4951/G:+44(0)7768982349       www.quantex-research.com

On 26 Jun 2003, Andrew Rechenberg wrote:

> Are you referring to the HT-aware scheduler in the kernel?  As far as I
> know the vanilla kernel has been HT-aware WRT SMP for quite some time. 
> But the scheduler is a differernt story.
> 
> Here is an article I found while Googling:
> 
> http://lwn.net/Articles/20161/
> 
> You can also check here:
> 
> http://people.redhat.com/mingo/O(1)-scheduler/
> 
> >From here it looks like there is big ol' patch for 2.4.21 for HT
> scheduling (or it might actually be in 2.4.21).  You may want to check
> with the kernel hackers to get a sure answer.
> 
> Hope this helps,
> Andy.
> 
> 
> On Thu, 2003-06-26 at 08:20, John Logsdon wrote:
> > Hi all
> > 
> > Can anyone tell me, what if the current vanilla kernel state (2.4.21) with
> > respect to back porting hyperthread, which I believe has been incorporated
> > in the latest RH kernels?  I want to add other patches so I prefer to work
> > from the Vanilla version to save too many hunks...
> > 
> > The changelogs are pretty quiet on this topic.
> > 
> > BTW I am running a dual Xeon 2650 under RH8.0.
> > 
> > TIA
> > 
> > John
> > 
> > John Logsdon                               "Try to make things as simple
> > Quantex Research Ltd, Manchester UK         as possible but not simpler"
> > j.logsdon <at> quantex-research.com              a.einstein <at> relativity.org
> > +44(0)161 445 4951/G:+44(0)7768982349       www.quantex-research.com
> > 
> > _______________________________________________
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> -- 
> Andrew Rechenberg <arechenberg <at> shermfin.com>
> Infrastructure Team, Sherman Financial Group
> 

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