Date: Tue, 24 Nov 1998 10:53:58 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: shimon@simon-shapiro.org Cc: matth@uk.aiesec.org, freebsd-alpha@FreeBSD.ORG Subject: Re: SCP/FTP Performance Message-ID: <13914.54304.379294.304492@grasshopper.cs.duke.edu> In-Reply-To: <XFMail.981124113018.shimon@simon-shapiro.org> References: <Pine.BSF.3.96.981124141223.20817A-100000@blue.bad.bris.ac.uk> <XFMail.981124113018.shimon@simon-shapiro.org>
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Simon Shapiro writes: > > Matt Hamilton, On 24-Nov-98 you wrote: > > On Mon, 23 Nov 1998, Simon Shapiro wrote: > > > > > I know I am missing something here, but it appears Alpha based. > > > > Not that I know a huge amount about this, but could it be some > > byte-order > > related problem? Something to do with switching the byte order around > > un-necessarily, before sticking on the wire? Or switching it wrongly > > when > > it gets back? > > I doubt that; First, it may add as much as 1% on an alpha. Second, the > alpha is already in network order. > > Simon Actually, its not in network byte order, but as you state, that's of little consequence. The alpha byte-swapping & checksum code could probably use a little work, but you're not going to notice much impact with 433+ Mhz Mhz 21164a's at speeds as slow as 100Mb. My suspicion is that its the fault of the 433au's tulip interface. The if_de.c driver support for DEC-branded 21143's, such as the one in your 433au, is bad. For example, I cannot get my personal workstations go into full-duplex mode in either FreeBSD or NetBSD. Your 64kb/sec speeds are typical of a duplex mismatch. With the 433au's tulip set to autosense, I suspect the duplex modes might be waffling between full & half. You might try hardcoding the alphas nics to 100baseTX. Cheers, Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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