以下引用MAGICWING在2004-7-25 18:02:41的发言：
能不能讨论一点实质性的东西？
比如缓存工作原理或超长流水线分支管理之类的。。。
只是这样不配叫硬件讨论贴吧？ |
你要讨论流水线分支和缓存,OK P4d的pipeline有40步PowerPCG4只有4步*86就喜欢长pipeline,高时脉,-->大发热量 Power4虽有长达16步的pipeline但有动态预支,和特制的2l cache deatil
"The cache subsystem tries to match this record-setting trend. Each core has 32KB of dual-channel data cache (with an access latency of only 1 cycle!) and 64KB of dual-channel instruction cache. Each cache consists of 128-byte lines; the data cache is organized as four 32-byte sectors, which can be read independently (it’s possible to write into one sector and read from two others, without jams). The instruction cache can write or read 32 bytes each cycle. The L2 cache is eight-channel, partially-associative, 128 bytes per line, 1536KB size. "
1个power4加足够RAM的话可并发10-20个windows
power4也不贵1p power4(1.25Ghz 8Mb 3l)+1Gb SDRAM+36Gb 15Krpm SCSI HDD也只要5XXX$以前386也要这价,你只搞定aix的桌面应用就ok了
