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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Why the temptation for dial users to crank back rwin/mtu?
On Sat, 6 Feb 1999 [email protected] wrote: > apparently there's some performance value in this (at least to the > immediate user) because they keep doing it in droves. It's not obvious > to me why the heck this would be. (warning: I am a protocol guy, but > I'm not a dialup guy at all.. and even less of a windows guy) This has been generally beat to death on nanog in the past. If you weren't around back then, dig around in the archive. I remember one of the subjects being "PC Bozoworld strikes again" or something like that. The short recap is that for some unknown reason the Microsoft TCP/IP stack is broken in some bizzare way that setting down the MTU on a good chunk of the machines out there will result in a dramatic speed increase. Why this occurs, I'm not sure anyone really knows. It would be really interesting to see a study of what the MS stack is doing and why it's faster. > MTU - at least this makes a little bit of sense.. If they're doing > HTTP/1.0 stuff with parallel connections then a smaller MTU is going > to make that parallelization latency much more effective and perceived > performance will go up some.. it doesn't impact full document Just for my information, does the MTU setting affect <received> packets in some way? My understanding was that a machine wouldn't send packets over the MTU size, but could recieve anything up to whatever the TCP/IP stack writer included in the stack. Guess I'll have to go dig out the RFC's. - Forrest W. Christian ([email protected]) ---------------------------------------------------------------------- iMach, Ltd., P.O. Box 5749, Helena, MT 59604 http://www.imach.com Solutions for your high-tech problems. (406)-442-6648 ----------------------------------------------------------------------
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