Date: Sun, 5 Dec 1999 15:07:15 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Geoff Buckingham <geoffb@chuggalug.clues.com> Cc: freebsd-alpha@FreeBSD.ORG Subject: Re: 64bitPCI Message-ID: <14410.50100.810277.209073@grasshopper.cs.duke.edu> In-Reply-To: <19991205195643.A43682@chuggalug.clues.com> References: <19991205195643.A43682@chuggalug.clues.com>
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Geoff Buckingham writes: > > I am building test platforms for an application with very great disk and > Network IO requirements. Which of the FreeBSD supported alphas have a > 64bit PCI bus ? > > Is anybody using 64bit isp, gigabit cards or vinum succesfully with > FreeBSD alpha? > > Is an alpha likely to outperform a modern x86 system IO wise? Yes. You want something based on the tsunami chipset found in the AlphaServer DS10 & DS20, Workstation XP1000 and DP264 boards. The DS20, DP264 and XP1000 have two independant PCI buses. The DEC terminology for this is "hose". The DS10 has a single hose with 3 64-bit slots & 2 32-bit slots. This costs < 1/2 as much as the xp1000, but also has good I/O bandwidth. I have not done more than verify that it can DMA to/from a single 64-bit slot in excess of 200MB/sec in both directions. The xp1000 has 2 64 bit slots (both on the same hose) and 3 32-bit slots (2 of which are on the secondary hose). This machine can DMA in excess of 200MB/sec. We have run TCP/IP between 2 xp1000s with 64-bit Myrinet cards at 1147Mb/sec. The DS20 & DP264 have even more memory bandwidth than the xp1000. They also have available 64-bit slots on both hoses. They are a little more costly though. I have never actually played with one. ------------------------------------------------------------------------------ Andrew Gallatin, Sr Systems Programmer http://www.cs.duke.edu/~gallatin Duke University Email: gallatin@cs.duke.edu Department of Computer Science Phone: (919) 660-6590 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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