It appears you have not yet registered with our community. To register please click here...

 
Go Back [M] > Madshrimps > WebNews
Prescott: The Last of the Mohicans? (Pentium 4: from Willamette to Prescott). Part II Prescott: The Last of the Mohicans? (Pentium 4: from Willamette to Prescott). Part II
FAQ Members List Calendar Search Today's Posts Mark Forums Read


Prescott: The Last of the Mohicans? (Pentium 4: from Willamette to Prescott). Part II
Reply
 
Thread Tools
Old 18th June 2005, 20:28   #1
Member
 
Sidney's Avatar
 
Join Date: Mar 2004
Posts: 15,738
Sidney Freshly Registered
Default Prescott: The Last of the Mohicans? (Pentium 4: from Willamette to Prescott). Part II

Here I would like to omit all the details of our endless search, but I have to admit that the idea to study carefully Intel’s patents turned out very fruitful in the long run. It is there that we found a pretty abstract description of a special system for repeated micro-operations processing aka replay. This system is intended for repeated execution of micro-operations that have already left the scheduler but were executed incorrectly for some reason.

This way, we revealed the details about a mysterious sub-system of the Pentium 4 processor, which has hardly been described in any Pentium 4 documentation, or any articles and reviews devoted to this processor micro-architecture. Well, this is very unexpected windfall! Especially, keeping in mind that we didn’t plan going rally that deep into details at this point.

Of course, we were very curious to find out how this system affects the processor performance. Moreover, it is always a challenge to investigate the features and peculiarities of a subsystem that hasn’t been known to the general public before. We should finally be able to explain the weird behavior of our CPU, anyway.

So, we were really excited about getting this mysterious replay thing. And I have to confess that we managed to achieve some really impressive results. I would like to stress that this article is the world’s first detailed discussion of the replay feature and its functioning peculiarities. Of course, the first thing we supposed that replay will be the key to the revealed deviation of the actual processor performance from the theoretical one.

Later we arrived at the following conclusion: it looks like we found much more than we were actually looking for. This Replay turned out very interesting as a not very well-known feature of the Pentium 4 micro-architecture which clarifies some of its mysteries as well as affects the processor performance.

http://www.xbitlabs.com/articles/cpu...etburst-2.html
__________________
lazyman

Opteron 165 (2) @2.85 1.42 vcore AMD Stock HSF + Chill Vent II
Sidney is offline   Reply With Quote
Old 18th June 2005, 20:32   #2
Member
 
Sidney's Avatar
 
Join Date: Mar 2004
Posts: 15,738
Sidney Freshly Registered
Default

A very long story/read, interesting, nevetheless.

Robbing Peter to pay Paul, Paul the "replay" is the bastard. As an end user, I really don't give a darn. Yet, the cover up is rather cynical to say the least.
__________________
lazyman

Opteron 165 (2) @2.85 1.42 vcore AMD Stock HSF + Chill Vent II
Sidney is offline   Reply With Quote
Reply


Similar Threads
Thread Thread Starter Forum Replies Last Post
Celeron D (cedarmill 65nm) vs. Pentium 4 (Prescott 90nm) johnmuffins Hardware Overclocking and Case Modding 1 30th July 2006 18:17
Quiet DIY OC'ed Pentium D 830 System, Part Two jmke WebNews 0 24th April 2006 21:17
Socket 775 cpu Sephirothsnake Mad Bargains 0 25th February 2006 20:31
Prescott: The Last of the Mohicans? Sidney WebNews 1 26th May 2005 04:48
Intel's Pentium M Desktop Part II: ASUS' Pentium M to Pentium 4 Socket Adapter jmke WebNews 0 25th March 2005 16:01
Pentium M on your Socket 478 platform: Part 2 Sidney WebNews 0 25th March 2005 05:10
Prescott Pentium 4 C0 can hang SP 2 install jmke WebNews 0 7th October 2004 11:38
Intel Pentium 4 Prescott!!!!! abysmal Hardware Overclocking and Case Modding 3 21st July 2004 10:41
Numerous bugs reported in Intel Prescott Pentium 4 jmke WebNews 4 26th June 2004 03:49
Three Pentium 4 Amigos - Northwood, Gallatin and Prescott Compared @ TweakTown jmke WebNews 0 16th May 2004 15:49

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


All times are GMT +1. The time now is 23:22.


Powered by vBulletin® - Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO