Date: Tue, 11 Mar 1997 15:01:21 +0000 From: Matt Thomas <matt@lkg.dec.com> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: hackers@freebsd.org Subject: Re: performance (was: 100 Mb/s cards) Message-ID: <199703111501.PAA11664@whydos.lkg.dec.com> In-Reply-To: Your message of "Tue, 11 Mar 1997 12:12:22 %2B0100." <199703111112.MAA29471@labinfo.iet.unipi.it>
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In <199703111112.MAA29471@labinfo.iet.unipi.it> , you wrote: > I just checked the data sheets of the 21140; too bad, it appears > that the 21140 can use unaligned buffers on the TRANSMIT side but > not on the receive side. As other controllers, a packet can be > split into multiple buffers though, so that a sensible (and > sufficiently general) fix would be to store the ethernet header > (12 bytes) in the first mbuf, and the body of the packet (starting > with the IP header) in the following mbuf cluster. Doesn't work. Tried it. The first buffer will have 16 bytes and you're in the same situation. -- Matt Thomas Internet: matt@3am-software.com 3am Software Foundry WWW URL: http://www.3am-software.com/bio/matt.html Westford, MA Disclaimer: I disavow all knowledge of this message
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