Date: Fri, 1 Dec 2000 11:06:55 -0700 From: "Kenneth D. Merry" <ken@kdm.org> To: Jin Guojun <jin@george.lbl.gov> Cc: hardware@FreeBSD.ORG Subject: Re: high bandwidth I/O motherboard (any recommendation?) Message-ID: <20001201110655.A14385@panzer.kdm.org> In-Reply-To: <200012011650.eB1GoYi11345@portnoy.lbl.gov>; from jin@george.lbl.gov on Fri, Dec 01, 2000 at 08:50:34AM -0800 References: <200012011650.eB1GoYi11345@portnoy.lbl.gov>
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On Fri, Dec 01, 2000 at 08:50:34 -0800, Jin Guojun wrote: > Even the PCI spec. says 32-bit/33MHz PCI bus should have 132MBps > I/O bandwidth, but none of these 32-bit/33MHz PCI chipset (Intel > or VIA) can give that high I/O bandwidth. > > The best I/O bandwidth I have seen is about 60MBps under FreeBSD 4.2. > I am not sure if this is limited by the memory controller or the PCI > bus controller. (I don't think the O.S. can control this bandwidth.) > > The newest PCI chipsets I have tested are: > > Intel 810/815e + 82801AA/82801BA > VIA VT82C694X + VT82C686A/VT82C686B > > Any comments/suggestion on which motherboard can give 120MBps I/O bandwidth? I haven't personally gotten 120MBps with 33MHz 32bit PCI, although I have gotten bandwidth in the range of 100MBps or so with BX chipset boards. (IIRC, that was with netperf, the zero copy patches and two Pentium II 450's.) Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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