Why the platform focus?

Article: Tukwila Update
By: savantu (savantu.delete@this.email.ro), February 6, 2009 1:51 pm
Room: Moderated Discussions
Linus Torvalds (torvalds@linux-foundation.org) on 2/6/09 wrote:
>slacker (s@lack.er) on 2/6/09 wrote:
>>You might want to note that QPI was implemented at the 65nm
>>node for Tukwila, and 45nm for Nehalem. Maybe you can call
>>your friends at Transmeta Novafora and ask them
>>how easy it is to synthesize high-speed I/O cells from
>>Verilog. Prepare for laughter.
>.. I bet the much bigger headache is the protocol design
>and verification. Yes, yes, you will want to also have a
>damn good set of people for the actual IO cells, but which
>part do you think a CPU architect really worries about:
>the cache coherency protocol and logic verification, or
>the low-level IO?
>I know which one I'd worry about, and which part would
>keep me up at night. Especially considering how Intel has
>lots of good people to do the actual low-level stuff (ie
>it was never a question of "we don't have that kind of
>expertise in-house and it's something new to us").
>So no, you wouldn't move the thing untouched, but the parts
>that really matter should all translate beautifully from
>45nm to 65nm, and is at a much higher level. Don't tell me
>that Itanium QPI couldn't leverage 90% of the work from
>the fact that x86 did it.
>In fact, even if you never lifted a single line of verilog
>(which I doubt is the case), just the test infrastructure
>and the verification of the protocol itself is a huge deal.
>Don't you agree?


According to a former Intel worker from another forum work on CSI ( now QPI ) was underway in 2000 when he left.CSI is the child of the former DEC Alpha team from Hudson.
It was supposed to ship with Tanglewood ( Tukwilla var 1.0 ) which was canceled in late 2004 because it used new , simpler , high clocked cores ( 8+1 IIRC ) and HP stepped in ( according to HP folks it was better to use 4 McKinley derived cores ).Either way , HP got its way and Tanglewood was dead.

What remained was the system interface and the uncore part which were kept on Tukwilla var 2.0 ( what we now know as Tuk ).CSI remained in the shadow for another 4 years.

Whitefield, a x86 Quad Core Xeon that used Pentium M derived cores designed in India, was supposed to field CSI in 2006. However, the project was killed.

So , how exactly did x86 help IPF here? It's actually the other way around. IPF teams carried the burden of developing Intel's next decade interconnect. As Paul points out , we're talking about 2 design centers , Fort Collins and Hudson with thousands of people.
That ( the increase in manpower and resources ) isn't consistent with a company that is planning to let IPF wither and die.

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                                    sufficiently intimate with the OSMichael S2009/02/26 05:29 AM
                                      sufficiently intimate with the OSanon2009/02/27 12:01 AM
                                      sufficiently intimate with the OSHoward Chu2009/02/27 12:37 AM
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  Tukwila Update - article onlineVincent Diepeveen2009/02/05 08:11 AM
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