ia32e, er EM64T that is...

Jesse Keating jkeating at j2solutions.net
Tue Sep 7 14:56:40 UTC 2004


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On Monday 06 September 2004 10:47, Alan Cox wrote:
> em64t as Intel currently call it is pretty close to the x86-64
> architecture so its not too bad a clone. It lacks prefetch/prefetchw
> which can also be used by some fancy user space stuff like image
> processors. It also lacks a hardware IOMMU so you may have
> performance problems going above about 3.5Gb of RAM depending on your
> other hardware.

I know they are similar, and em64t lacks some things that AMD64 has, 
however we have lots of customers that refuse to run anything but 
Intel, and they want to run Naconas.  I'm just making sure that the 
performance hit they get against Opteron isn't due to misconfigured 
software.  If what Arjan says is true, and it's a runtime detection 
thing and I don't have to build a complete kernel optimized for em64t 
than that is cool.  Thanks.

- -- 
Jesse Keating RHCE      (http://geek.j2solutions.net)
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