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Re: [PATCH] set CONFIG_NUMA on PAE kernel, i686 only.

On Tue, Jul 25, 2006 at 12:29:34PM -0700, keith mannthey wrote:
 > On Tue, 2006-07-25 at 14:34 -0400, Dave Jones wrote:
 > > On Tue, Jul 25, 2006 at 11:24:42AM -0700, keith mannthey wrote:
 > > 
 > >  >  Modern Summit hardware x460 is EMT64e (x440,x445 is not) but as you
 > >  > know sometimes customers run 32bit OS's on 64bit boxes.
 > > 
 > > I hear this from time to time, and every time I ask "why doesn't
 > > 32bit emulation in 64bit kernel work for you work?", the only
 > > answers that seen to come back are various flavours of
 > > "we didn't know about it" or "haven't tried it".
 >   Is there a "Guarantee" that 32bit apps will just work with 64bit
 > kernels?  I don't think all 32bit apps test (or work) on 64bit OS and a
 > such don't fall in the "Supported" configuration. Customers like to have
 > ground to stand on when things break.  If they run unsupported in their
 > software stack things can get messy (who will fix it?) if problems arise
 > or performance is bad compared to 32bit native. 

This is exactly the sort of hand-waving I was talking about.
If something doesn't work, lets find out why and _FIX_ it.
Scaremongering, and handwaving isn't going to solve a single bug.

32bit emulation sees a fair amount of testing. I daresay, a significant
amount more than i386 NUMA has ever seen, so "There might be bugs" is
just a ridiculous position.



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