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 <[EMAIL PROTECTED]> 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 â 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/
