Date: Mon, 26 May 1997 09:12:06 +0300 (EEST) From: Narvi <narvi@haldjas.folklore.ee> To: Charles Henrich <henrich@crh.cl.msu.edu> Cc: Brian Tao <taob@nbc.netcom.ca>, freebsd-chat@FreeBSD.ORG Subject: Re: Pentium II-266Mhz Message-ID: <Pine.BSF.3.96.970526084651.21418A-100000@haldjas.folklore.ee> In-Reply-To: <19970526010046.05547@crh.cl.msu.edu>
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On Mon, 26 May 1997, Charles Henrich wrote: > On the subject of Re: Pentium II-266Mhz, Brian Tao stated: > [snip] > > I presume the first involves the CPU going to main memory, while the > > second fits entirely in L2 cache? What's the bandwidth over a PCI bus? > > 132MB/sec? It looks like the CPU can push almost twice that. Time for > > a 100-MHz bus or a separate CPU-to-RAM bus... > > Yep, thats been my gripe for a long time. The PCI bus sucks, it needs to be > twice the bandwidth of the CPU (or more!) for growth, and memory access times > need to go down. I would bet if someone did a formal study, that a huge > percentage of Intel cycles are spent waiting for loads.. Speed up the > Pentium(Pro/PII) without changing a thing, except the motherboad! PCI doesn't suck. These are the chipset makers who do. Just get a motherboard with 64-bit PCI backbone (that is, the 32 bit slots are behind 64/32 bit bridges) provides twice the bandwidth. As for memory, it is also your problem that you don't have a motherboard with memory controller clocked at xxxMhz with a wider datapath than 64 bits. And the ability to have real big real fast caches. Complain to the chipset makers. Before everyone starts shouting at me - the problem in the PC world is that even if you have the money, you currently can't get what you need. Sander PS. Port FreeBSD to PowerPC and buy RS/6000 servers from IBM. Some of these do have 100Mhz/166Mhz and wide bus with 604e (which has about the same performance as PPro 200 at 200Mhz/50Mhz bus). The cost? Well who's talking about that. > > -Crh > > Charles Henrich Michigan State University henrich@msu.edu > > http://pilot.msu.edu/~henrich >
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