Path: ...!weretis.net!feeder9.news.weretis.net!i2pn.org!i2pn2.org!.POSTED!not-for-mail
From: mitchalsup@aol.com (MitchAlsup1)
Newsgroups: comp.arch
Subject: Re: Stealing a Great Idea from the 6600
Date: Thu, 13 Jun 2024 17:00:55 +0000
Organization: Rocksolid Light
Message-ID: <9fb8868c1ee40a4481d20ed7214e146b@www.novabbs.org>
References: <lge02j554ucc6h81n5q2ej0ue2icnnp7i5@4ax.com> <v02eij$6d5b$1@dont-email.me> <152f8504112a37d8434c663e99cb36c5@www.novabbs.org> <v04tpb$pqus$1@dont-email.me> <v4f5de$2bfca$1@dont-email.me>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Info: i2pn2.org;
	logging-data="4088001"; mail-complaints-to="usenet@i2pn2.org";
	posting-account="65wTazMNTleAJDh/pRqmKE7ADni/0wesT78+pyiDW8A";
User-Agent: Rocksolid Light
X-Rslight-Site: $2y$10$C6UKmPh5CxOv5XKVC7q8BON2wQS4x4DDGtRusB9EBKXUQZ2fk9gsO
X-Spam-Checker-Version: SpamAssassin 4.0.0
X-Rslight-Posting-User: ac58ceb75ea22753186dae54d967fed894c3dce8
Bytes: 1547
Lines: 11

Kent writes an interesting thesis on why OoO overtook IO wrt
scheduling.

One can add other scheduling effects::
a) change in latency on some FUs but not on others
b) change is register ports per instruction
c) branch prediction changes
d) cache timing wrt prefetch

Having gone through the transition (1-wide IO, 2-wide IO, 6-wide OoO)
the OoO machine was simply less complexity--or to say it a different 
way--the complexity was more orderly (and more easily verified).