Formerly About Advanced Micro Devices Message Board

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Politics : Formerly About Advanced Micro Devices

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To: Jim McMannis who wrote (42378)	11/30/1998 3:04:00 AM
From: Scumbria	Read Replies (1) of 1572942

Jim, Some people have been turning up the heat on Anand and he defends Winstone 99. I honestly think the guy has lost it... Some of Anand's explanations indicate that he doesn't have a very thorough understanding of his subject. His comment "the real benefit of write allocate is visible in writes to the write allocated cache line after the initial write allocate." is mostly incorrect. The real value of write allocate is that it increases the percentage of read hits. Cacheable data that is written (in a single processor system) will almost always be read back. If it is not read back, why did we bother to write it? Turning on write allocate can reduce the cache read miss percentage by as much as 20%. Scumbria

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