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Date:      Sat, 05 Jul 1997 05:04:51 -0500
From:      Brad Hlista <bjh@instanton.com>
To:        freebsd-questions@FreeBSD.ORG
Subject:   tcp/ip benchmarks???
Message-ID:  <33BE1C43.3BE00485@instanton.com>

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Hello,

Has anyone out there done any tcp/ip benchmarks?
max packets per sec with fast-ethernet
max throughput per sec with fast-ethernet

What card combinations have people tried?

Does adding multiple 100 Mbs cards help? Or are
we already CPU limited with one card when driving
for max packet rate.  What happens for throughput,
do additional cards help?

- generally max packet rate occurs with the smallest
packet size (UDP 8 bytes) + ethernet size


I would also like to know about ftp performance.

What buffer sizes does FreeBSD allocate for each command
connection?  What size for each data connection?

I would guess that it uses a window size according to
a client, but I can see this becoming a real problem if the
ftpd has to allocate and free buffers in a high performance
environment.

I'm particularly interested in number of concurrent downloads
vs. number of concurrent user sessions.

While the server supports 2000 users quite well
(ftp.cdrom.com) how does it do when 100-200 simultaneous
downloads are taking place?

Has anyone noted behavior for various connect speeds?

Thank you,
Brad Hlista
bjh@instanton.com




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