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- Newsgroups: news.sysadmin
- Path: sparky!uunet!darwin.sura.net!wupost!zaphod.mps.ohio-state.edu!uunet.ca!geac!zooid!ross
- From: Ross Ridge <ross@zooid.guild.org>
- Subject: Re: NNTP over slip or uucp?
- Organization: ZOOiD BBS
- Date: Wed, 22 Jul 1992 05:45:43 GMT
- Message-ID: <1992Jul22.054543.146@zooid.guild.org>
- References: <55273@olivea.atc.olivetti.com> <1992Jul19.182723.19753@zooid.guild.org> <4814@airs.com>
- Lines: 43
-
- ross@zooid.guild.org (Ross Ridge) writes:
- >The 'g' protocol has 64 byte packets, any TCP specific protocol I've
- >seen has no packet size.
-
- ian@airs.com (Ian Lance Taylor) writes:
- >THe 't' protocol, which is intended for use over TCP, uses 1024 byte
- >packets with a 4 byte overhead per packet.
-
- Yah, I found that out almost immediately I posted that. I also found
- out that everyone uses 'e' protocol over TCP, and that everyone uses
- 't' protocol over TCP from someone else...
-
- >>> The 40/1020 overhead is under 4%. I don't consider that "huge", do you?
- >
- >>40/64 seems very huge to me.
- >
- >I don't see any reason to assume that a single UUCP packet will become
- >a single TCP packet...
-
- What else is the kernel going to do with it after getting a "write(tcp_fd,
- 64, uucp_packet);"? It could buffer it hoping that another write on the
- TCP file descriptor will come soon, but likely it's just going to wrap a
- TCP header around it, then an IP one around that, and then send it down the
- SLIP link. It's been a while since I've mucked around in kernal sources
- (or UUCP sources), maybe I'm wrong, but it doesn't seem too unreasonable
- an assumption to make.
-
- >>I'm talking about a '386 Xenix Public Access Unix system with four lines,
- >>talking to a '286 on a heavy loaded PC LAN of over 200 PC's, downloading
- >>files at 1400cps with PEP. The best, accurate(*), speeds we've gotten with
- >>UUCP over PEP (with UUCP spoofing) is just over 1200cps. Zmodem xfer rates
- >>remain almost constant for any load, UUCP xfer rates seem to drop off
- >>almost immediately.
-
- I should correct this, the best we've gotten with PEP and UUCP is 1300cps.
-
- Ross Ridge
-
- --
- Ross Ridge - The Great HTMU l/ //
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