Date: Tue, 11 Feb 2003 21:54:15 +0100 (CET) From: Marco Beishuizen <marco@beishuizen.info> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: FreeBSD alpha mailing list <alpha@FreeBSD.ORG> Subject: Re: Why is XFree86 on FreeBSD/Alpha much slower? Message-ID: <Pine.BSF.4.53.0302112147000.294@tsunami.bsd> In-Reply-To: <15945.24538.794799.926276@grasshopper.cs.duke.edu> References: <Pine.BSF.4.53.0302112042190.294@tsunami.bsd> <15945.23721.759825.313603@grasshopper.cs.duke.edu> <Pine.BSF.4.53.0302112129370.294@tsunami.bsd> <15945.24538.794799.926276@grasshopper.cs.duke.edu>
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On Tue, 11 Feb 2003, the wise Andrew Gallatin spoke, and said: > > Marco Beishuizen writes: > > On Tue, 11 Feb 2003, the wise Andrew Gallatin spoke, and said: > > > > > > > > Marco Beishuizen writes: > > > > > > > > Hi, > > > > > > > > I have two machines, one Intel (450mhz) and one Alpha (600mhz). Both are > > > > running FreeBSD 4.7-RELEASE and WindowMaker as windowmanager. The Intel > > > > has a Matrox G400max and the Alpha has a Matrox G450. > > > > > > What kind of alpha? What sort of slot is graphics board in on the > > > alpha? On the pc? > > > > > > Drew > > > > The alpha is a PWS600au, it has a 21164 cpu. The Matrox sits in one 32 > > bits PCI slot. The Intel is a PIII/450, and the G400 sits in the AGP slot. > > > > OK, so the AGP slot probably has at least 500MB/sec DMA. > > But: All 32-bit slots on your alpha sit behind a pci-pci bridge chip, > connecting to a main bus whose DMA characteristics are similar to: > > DMA rate for 8192 Byte pages (32bit / 33MHz bus) > Timing 32 pages. > bus_read (send) = 73 MBytes/s > bus_write (recv) = 129 MBytes/s > > > The PCI-PCI bridge slows this down even further. You might try > setting the magic SRM console variable to allow putting the card > into the 64-bit slot (see the alpha hardware notes that Wilo > maintains). But it will still suck moderatly. > > FWIW, the AGP Permedia board in my UP1000 doesn't suck. > > Drew I always thought that graphics performance was the strengh of the Alpha. But it seems to be the opposite. It's a lot slower than the Intel, but I don't think that it sucks so much that I should buy another graphics board. I guess I'll have to live with it. Marco -- "What are you doing?" "Examining the world's major religions. I'm looking for something that's light on morals, has lots of holidays, and with a short initiation period." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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