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- Path: sparky!uunet!gatech!concert!duke!trt
- From: trt@duke.cs.duke.edu (Tom Truscott)
- Newsgroups: comp.unix.aix
- Subject: Re: Satellites vs. FTP
- Message-ID: <712451601@romeo.cs.duke.edu>
- Date: 29 Jul 92 23:13:22 GMT
- References: <1992Jul28.013938.28384@Arco.COM>
- Organization: IBM RTP
- Lines: 19
-
- Try increasing the TCP "window sizes", which limits how many
- bytes can be in flight (sent but unacknowledged):
-
- no -o tcp_sendspace=16384
- no -o tcp_recvspace=16384
-
- Those are the defaults in AIX 3.2. "30000" might be yet faster.
- I wouldn't try anything above 65000.
-
- BOTH ends of the connection must have the increased window sizes,
- and making them all the same size is probably a good idea.
- On non-AIX systems one typically patches those variables
- in the kernel source, or binary (e.g. "adb /vmunix"),
- or running kernel (e.g. "adb /vmunix /dev/kmem").
-
- You can also set the sizes per-socket with setsockopt(), but of course
- that won't affect existing binaries such as ftp.
-
- Tom Truscott
-