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Politics : Formerly About Advanced Micro Devices

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To: Ali Chen who wrote (62582)	6/21/1999 3:06:00 AM
From: Tenchusatsu	Read Replies (1) of 1572295

<What makes you think that the "north" bridge can't send these messages simultaneously? Remember, every processor has a separate "bus", is not it?> Doesn't matter. The chipset has to receive the request from the processor before it informs the other processors. It takes time to relay that request. On a shared multiprocessor bus, all processors simply watch the bus. No additional latency. On the other hand, this problem can be solved using snoop filters on the north bridge. This way, the chipset knows exactly which lines are owned by which processors, so snoop traffic can be reduced tremendously. Of course, a snoop filter adds additional cost to the chipset (128K per K7 w/ 2MB L2 cache, for a total of 1MB of snoop filter for an 8-way K7 system), but it's not all that much compared to the entire cost of a 4 or 8-way K7 server. <Second, how did you manage to do a research on a non-disclosed-yet system architecture?> Because the P2P architecture has been done before. Alpha isn't the inventor of P2P, you know. Tenchusatsu

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