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- Path: news.ultranet.com!usenet
- From: "Albert P. Belle Isle" <belleisl@cerberus-sys.com>
- Newsgroups: alt.winsock,alt.winsock.trumpet,comp.dcom.modems
- Subject: Re: MTU Settings
- Date: Mon, 19 Feb 1996 09:56:01 -0500
- Organization: Cerberus Systems, Inc.
- Message-ID: <31288F81.39DF@cerberus-sys.com>
- References: <4g7u9u$86u@news1.ucsd.edu>
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-
- david wrote:
- >
- > I have tried different MTU settings to which is the fastest, but
- > haven't really noticed a great difference with shorter files. It
- > seems that with longer files it would make a difference.
- > Does anyone know of a way to check for sure which MTU
- > setting is the fastest? I'm using a 14.4.
- >
- > Thanks.....
- >
- > Dave
-
- Dave:
-
- MTU is an IP (routing) parameter that can place an upper limit on packet
- size, but doesn't otherwise determine the amount of data transferred per
- packet. The MTU that really matters is the smallest one in all the routers
- on the download path between you and the file server, and is independent of
- any MTU value you set for your WinSock. (Your MTU should match the MTU used
- by the routers on your access provider's Local Area Network).
-
- File transfers using FTP or HTTP are accomplished as a sequence of TCP
- transactions, whose data segment size is the smaller of the MSS settings of
- the two participants. This setting, and the default size of the flow control
- data window (RWIN) are what you tune for speed.
-
- I've put together a tutorial FAQ on the subject of WinSock speed-tuning
- (and related problems that prevent it, like com port overruns) at the
- below-listed URL, if you're interested in more details.
-
- Regards,
-
- Al
-
- --
- ==================================================================
- Albert P. Belle Isle
- Cerberus Systems, Inc.
-
- Al's Winsock Tuning FAQ -
- http://www.cerberus-sys.com/~belleisl/mtu_mss_rwin.html
- ==================================================================
-