Re: AMD64 VS EM64T
Hi Everybody,
there is a 67 page Benchmark comparison betweeen the Athlon type CPUs and the
Pentium 4 types (including Prescott). The review does NOT include the
Opterons ;-(, but is has a lot of very detailed benchmark charts. 29 charts
for data transfers of each CPU alone + 35 benchmark charts (comparison).
The only problem is as far as I know this article is only available in German.
http://www.tecchannel.de/hardware/1244/index.html
"Test: Athlon 64 FX-55 & 4000+"
They have a english website here :
http://www.tecchannel.com/
,but unfortunately it does not contain even as near info as the german pages.
The article above does not seem to be available in english.
The article is free to read online or you can buy the PDF version for 0.80
Euro (1$).
I have it but the copyright does not allow me to forward it to anybody.
(Thank you for understanding)
Best regards
Nils Valentin
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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