From: "Nigel Roles" <nigel@9fs.org>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: RE: [9fans] nvidia scrolling performance
Date: Mon, 1 May 2006 07:52:43 +0100 [thread overview]
Message-ID: <HOEHIDJJJINMLFPOLFJCAEKNDGAA.nigel@9fs.org> (raw)
In-Reply-To: <44553B66.5010604@lanl.gov>
9fans-bounces+ngr=9fs.org@cse.psu.edu wrote:
> Steve Simon wrote:
>
>> I may be talking rubbish but I understood this is a fundamental
>> problem with reading VGA memory over the PCI bus. VGA cards are
>> designed for fast writes and not fast reads.
>
> depends.
>
> on pci and AGP it's an issue.
> AGP has the assymetric bandwidth built in.
>
> on PCI express, it's supposed to get much better.
>
>
>> I do hear that some cards are appearing with dual PCIX which will
>> allow symetric access speeds to the frame buffer.
>>
>
> Note that PCIX is not pci express (PCIe or PCI-e or PCI-E). It's so
> confusing. PCIX is PCI-X which is an old, slow bus.
>
> ron
PCIX is slow? Is 34Gbps not quick enough for you?
next prev parent reply other threads:[~2006-05-01 6:52 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-29 21:39 erik quanstrom
2006-04-30 4:00 ` jmk
2006-04-30 16:10 ` Russ Cox
2006-04-30 18:12 ` Steve Simon
2006-04-30 22:34 ` Ronald G Minnich
2006-05-01 6:52 ` Nigel Roles [this message]
2006-05-01 19:58 ` Ronald G Minnich
2006-05-01 20:10 ` David Leimbach
2006-05-01 0:30 erik quanstrom
2006-05-01 17:44 ` Russ Cox
2006-05-01 17:57 ` Artem Letko
2006-05-01 19:02 ` Russ Cox
2006-05-01 0:52 erik quanstrom
2006-05-01 1:00 ` Paul Lalonde
2006-05-05 15:46 erik quanstrom
2006-05-05 15:56 ` Paul Lalonde
2006-05-05 16:01 ` David Leimbach
2006-05-05 16:21 ` Paul Lalonde
2006-05-05 16:59 ` David Leimbach
2006-05-05 16:05 ` Wes
2006-05-05 17:07 ` Ronald G Minnich
2006-05-05 17:30 ` Paul Lalonde
2006-05-05 16:08 erik quanstrom
2006-05-05 16:42 ` David Leimbach
2006-05-05 17:22 erik quanstrom
2006-05-05 17:32 ` Paul Lalonde
2006-05-05 18:08 erik quanstrom
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