Re: AMD64 VS EM64T
O.K I found one more article. Here are all 4 articles neatly listed up
http://www.tecchannel.de/hardware/1441/index.html
http://www.tecchannel.de/hardware/1456/index.html
http://www.tecchannel.de/hardware/1244/index.html
http://www.tecchannel.de/hardware/1235/index.html
Best regards
Nils Valentin
Tokyo / Japan
http://www.be-known-online.com
On Saturday 04 December 2004 00:35, Nils Valentin wrote:
> Hi veverybody,
>
> also this two articles are only in german
>
> http://www.tecchannel.de/hardware/1441/index.html
> http://www.tecchannel.de/hardware/1456/index.html
>
> I still hope that somevody finds them useful.
>
>
> Best regards
>
> Nils Valentin
> Tokyo / Japan
> http://www.be-known-online.com
>
> On Friday 03 December 2004 09:04, Jin Zhao wrote:
> > Just found out this excellent article about server performance:
> > http://www.samag.com/documents/s=9408/sam0411b/0411b.htm
> >
> > This is the best I read so far and I highly recommend it to everybody
> > considering 64 bit. However, it is still purely from a hardware view.
> > Does anybody knows any reviews from OS softwares, esp Linux? Which
> > platform linux works better with, AMD64 or EM64T?
> >
> > Thanks,
> >
> > Jin
> >
> > Paolo Alexis Falcone wrote:
> > >On Thu, 02 Dec 2004 15:41:10 -0600, Jin Zhao <jzhao@qcorps.com> wrote:
> > >>I am currently faced with choosing one of them as our forthcoming 64
> > >> bit platform. So far I read a couple of reviews, most of which seems
> > >> favor AMD64 a little bit. I also did some initial testings on an
> > >> opteron box with Debian pure64 unstale. So far it looks good.
> > >>
> > >>The price differrence is not a big issue. The most important are
> > >>performance, reliability and compatibility, esp on Linux, most likely
> > >>Debian. We will use them to run server side java applicaitons.
> > >>
> > >>Redhat mentioned this in their realease statement:
> > >>"Software IOTLB — Intel EM64T does not support an IOMMU in hardware
> > >>while AMD64 processors do. This means that physical addresses above 4GB
> > >>(32 bits) cannot reliably be the source or destination of DMA
> > >>operations. Therefore, the Red Hat Enterprise Linux 3 Update 2 kernel
> > >>"bounces" all DMA operations to or from physical addresses above 4GB to
> > >>buffers that the kernel pre-allocated below 4GB at boot time. This is
> > >>likely to result in lower performance for IO-intensive workloads for
> > >>Intel EM64T as compared to AMD64 processors."
> > >>
> > >>This issue may affect database usage, but probably not a java
> > >>applicaiton server. There might be other unkown issues as well. I am
> > >>eager to know what are the Debian team and users' point on these two
> > >>platforms, esp those who already used them.
> > >
> > >AMD's original implementation of their AMD64 architecture is gauged as
> > >superior engineering-wise by many hardware reviewers.
> > >
> > >The Intel implementation still suffers from bandwidth starvation as
> > >the same bus architecture as of old is still being used. This causes
> > >problems when you get more processors and memory, which the AMD
> > >implementation solves by making each processor have its own set of
> > >memory and resources.
--
kind regards
Nils Valentin
Tokyo/Japan
http://www.be-known-online.com/mysql/
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