Date: Thu, 15 Jul 1999 10:08:29 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "John W. DeBoskey" <jwd@unx.sas.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: tcp windowsize query? Message-ID: <199907151708.KAA11425@apollo.backplane.com> References: <199907151549.LAA78679@bb01f39.unx.sas.com>
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: If I may re-phrase.. How do I determine if the send/recv spaces
:are large enough, and if not, how many times I bumped into the
:wall?
:
:Thanks!
:John
It depends entirely on the type of traffic your machine is
handling. A large web server usually uses relatively small
(16K or 32K) window sizes in order to avoid wasting memory.
It might be handling a thousand active connections.
A machine that is running over a long haul fiber or over a
very fast link might want to use larger window sizes to
keep the pipeline full, but only if it really needs to max
out per-connection bandwidth.
A machine that is running over slower links can make due
with smaller tcp window sizes. Or perhaps if you have a
machine running over a very slow link, like a modem link,
you may want to significantly reduce the tcp window size
for bulk transfers in order to get better interactive
performance. e.g. working over a remote connection while
at the same time downloading a big tar file via ftp or a
browser.
-Matt
Matthew Dillon
<dillon@backplane.com>
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