From: Ronald G Minnich <rminnich@lanl.gov>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] nvidia scrolling performance
Date: Sun, 30 Apr 2006 16:34:14 -0600 [thread overview]
Message-ID: <44553B66.5010604@lanl.gov> (raw)
In-Reply-To: <04c347e8d648750d2e5c10d133a878b9@quintile.net>
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
next prev parent reply other threads:[~2006-04-30 22:34 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 [this message]
2006-05-01 6:52 ` Nigel Roles
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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