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* [9fans] Current status of amd64 port?
@ 2007-11-15 22:51 Anthony Sorace
  2007-11-15 22:56 ` Uriel
  2007-11-15 23:14 ` Tharaneedharan Vilwanathan
  0 siblings, 2 replies; 34+ messages in thread
From: Anthony Sorace @ 2007-11-15 22:51 UTC (permalink / raw)
  To: 9fans

What's the current status of the AMD64 port (compiler and kernel)?  
I've just got a new server which would make a positively lovely  
target for it. Alternately, who's the contact person?
Anthony


^ permalink raw reply	[flat|nested] 34+ messages in thread
* Re: [9fans] Current status of amd64 port?
@ 2007-11-16  0:11 Joshua Wood
  2007-11-16 14:43 ` David Leimbach
  0 siblings, 1 reply; 34+ messages in thread
From: Joshua Wood @ 2007-11-16  0:11 UTC (permalink / raw)
  To: 9fans

> 64 bits is neither here nor there in a vaccuum.  you want 64 bits if
> a) you need more than 4GB of memory, or
> a) those extra registers and direct vlong really matter for  
> performance.
> otherwise it's just a lot of extra zeros.
> it's kind of silly to run 64-bit linux on a machine with <= 4GB of  
> memory.
>

Some testing we did about a year ago showed that (for us) even the  
extra registers -- I always thought the sweetest-sounding part of the  
deal -- help sometimes, but not always. I ended up thinking it was  
because caches hadn't necessarily grown apace with address space. The  
distance between cpu and main memory seemed to have expanded again...

64 bits was still the simplest path to > 4G memory for those linux  
machines in that situation, but the observation surprised me.

--
Josh


^ permalink raw reply	[flat|nested] 34+ messages in thread
[parent not found: <20071116170014.595B2108A1@mail.cse.psu.edu>]

end of thread, other threads:[~2007-11-17  6:38 UTC | newest]

Thread overview: 34+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-11-15 22:51 [9fans] Current status of amd64 port? Anthony Sorace
2007-11-15 22:56 ` Uriel
2007-11-16  6:14   ` ron minnich
2007-11-15 23:14 ` Tharaneedharan Vilwanathan
2007-11-15 23:39   ` erik quanstrom
2007-11-16  0:10     ` Tharaneedharan Vilwanathan
2007-11-16  0:18     ` Anthony Sorace
2007-11-16  7:57     ` Robert William Fuller
2007-11-16 10:05       ` erik quanstrom
2007-11-16 10:20         ` Charles Forsyth
2007-11-16 22:38         ` ron minnich
2007-11-16 22:46           ` Tharaneedharan Vilwanathan
2007-11-16 23:20             ` erik quanstrom
2007-11-16 23:19           ` erik quanstrom
2007-11-16 23:40             ` Charles Forsyth
2007-11-16 23:38               ` ron minnich
2007-11-16 23:56                 ` Charles Forsyth
2007-11-16 23:54                   ` erik quanstrom
2007-11-17  0:14                     ` ron minnich
2007-11-17  0:23                       ` Charles Forsyth
2007-11-17  0:30                         ` ron minnich
2007-11-17  0:33                           ` erik quanstrom
2007-11-17  1:08                           ` Charles Forsyth
2007-11-17  6:38                             ` Geoffrey Avila
2007-11-16 14:41     ` David Leimbach
2007-11-16 14:46       ` erik quanstrom
2007-11-16 15:33         ` Wilhelm B. Kloke
2007-11-16 15:33         ` David Leimbach
2007-11-16 15:35           ` David Leimbach
2007-11-16 15:53           ` Charles Forsyth
2007-11-16 16:21             ` David Leimbach
2007-11-16  0:11 Joshua Wood
2007-11-16 14:43 ` David Leimbach
     [not found] <20071116170014.595B2108A1@mail.cse.psu.edu>
2007-11-16 23:10 ` Joshua Wood

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