Re: Performance problems on 4/8way Opteron (dualcore)

A 4xDC would be far more sensitive to poor NUMA code than 2xDC so I'm 
not surprised I don't see performance issues on our 2xDC w/ < 2.6.12.


J. Andrew Rogers wrote:
> On 7/30/05 12:57 AM, "William Yu" <wyu@talisys.com> wrote:
> 
>>I haven't investigated the 2.6.12+ kernel updates yet -- I probably will
>>do our development servers first to give it a test.
> 
> 
> 
> The kernel updates make the NUMA code dual-core aware, which apparently
> makes a big difference in some cases but not in others.  It makes some
> sense, since multi-processor multi-core machines will have two different
> types of non-locality instead of just one that need to be managed.  Prior to
> the v2.6.12 patches, a dual-core dual-proc machine was viewed as a quad-proc
> machine.
> 
> The closest thing to a supported v2.6.12 kernel that I know of is FC4, which
> is not really supported in the enterprise sense of course.
> 
> 
> J. Andrew Rogers
> 
> 
> 
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