PCDVD數位科技討論區 - Pentium Dual-Core E5200 將發佈 R0 步進 = 新增指令集 + 省電機能對應

PCDVD數位科技討論區 (https://www.pcdvd.com.tw/index.php)

- 系統組件 (https://www.pcdvd.com.tw/forumdisplay.php?f=19)

引用:

作者dellasus865pe

新增指令（XSAVE/SRSTOR）

???? :confused:

找了一下，並不是屬於SSE4的指令

Google一下也只找到R0的新聞

真不知道有什麼功能 :confused: .......

引用:

作者zohar

找了一下，並不是屬於SSE4的指令

Google一下也只找到R0的新聞

真不知道有什麼功能 :confused: .......

這兩個指令是搭配 PSI 用的，E8400 的 E0 就加過了

搜尋 XSAVE PSI 就有答案

這顆比E2140超到3G會快上多少??

E5200不支援SSE4.1指令集真的是很可惜
只能說Intel把市場區隔(閹割?)的太細了

引用:

作者pepd65

E5200不支援SSE4.1指令集真的是很可惜
只能說Intel把市場區隔(閹割?)的太細了

SSE4.1不是萬能
況且用到的機會也很低
某雜誌有針對SSE4.1做過評測
有時開啟SSE4.1反而效能降低

最先出現於E8500, E8400

http://article.gmane.org/gmane.comp...xen.devel/51790

引用:

From: Cui, Dexuan <dexuan.cui <at> intel.com>
Subject: RE: [PATCH] Add xsave/xrstor support to Xen
Newsgroups: gmane.comp.emulators.xen.devel
Date: 2008-05-28 13:11:02 GMT (39 weeks, 4 days, 14 hours and 52 minutes ago)

The xsave/xrstor infrastructure is mainly for extensibility with respect to the "processor extened
states" since more extended states are coming (i.e. http://softwarecommunity.intel.com/...ce-31943302.pdf).
With the patch, XSAVE-aware HVM guest can make use of the coming extended features.

And Intel SDM 3A: chatper 12 ( SYSTEM PROGRAMMING FOR INSTRUCTION SET EXTENSIONS AND PROCESSOR EXTENDED
STATES) supplies a generic description.

BTW, some CPU, such as Intel Core 2 Duo Processor E8500, E8400, have had the support of the XSAVE/XRSTOR instructions.

For now, the xsave_area is at least 512 + 64 (the xsave header) = 576 bytes in length, though the first 512
bytes are completely compatible with the legacy 512-byte arch.guest_context.fpu_ctxt; actually we
also have to save the per-vcpu 64-bit "xfeature_mask", and the gloabal variables
"xsave_cntxt_max_size, xfeature_low, xfeature_high" (imagine different CPU has different XSAVE
capability). So I think we have to extend the current save/restore format.

引用:

作者呆灣狼

SSE4.1不是萬能
況且用到的機會也很低
某雜誌有針對SSE4.1做過評測
有時開啟SSE4.1反而效能降低

為何用到的機會很低呢? :confused:
順便請問這是哪一家雜誌哪一期做的評測呢?

SSE4.1不是著重在增強多媒體應用嗎?
例如影音方面的軟體解碼及編碼能力
這應該很實用才對啊

而且現在有越來越多的Codec支援SSE4.1了