Date: Thu, 15 Jun 2006 14:57:52 -0400 From: Charles Swiger <cswiger@mac.com> To: Paul Marciano <pm940@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: fxp driver performance expectations Message-ID: <8A5A6474-58E1-43EB-88DF-9C7E69DECF13@mac.com> In-Reply-To: <20060615182540.43537.qmail@web54009.mail.yahoo.com> References: <20060615182540.43537.qmail@web54009.mail.yahoo.com>
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On Jun 15, 2006, at 2:25 PM, Paul Marciano wrote: > For larger packets (e.g. 700 bytes) I am getting > 100Mbps throughput port to port. > > For min-size packets (64 bytes) I am only seeing > around 60Mbps. Increasing HZ and the polling > parameters does not help. You should be aware that the minimum 64-byte packet size does not count the 8-byte ethernet frame preamble (well, 7 bytes of preamble and 1 byte called the "start frame delimiter"), which means that you'll only be able to get a theoretical maximum of about 87 Mbps of packet data through at the 64-byte packet size. -- -Chuck
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