Date: Tue, 20 Feb 1996 18:59:13 -0800 From: davidg@Root.COM (David Greenman) To: hackers@freebsd.org Subject: Re: mbuf enhancement patch Message-ID: <199602210259.SAA04978@Root.COM>
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>>>I found the ep driver always keeps some mbuf's in its pool. Is this >>>because mbuf allocation is too expensive for boards which equip small >>>receive buffer? If this is the case, some improvement (not mine :-) is >>>desirable. >> >> I think that's what the author thought, but the FIFO on the 3c509 should be >>sufficiently large enough to not need the extra 1% of speed that having the >>private pool gets you. Our malloc implementation is quite efficient, actually. > >The old 3c509 has 2k bytes RX FIFO. Is this large enough? Yes, but a bit tight. If the driver were properly written, large packets would be put in mbuf clusters which are allocated out of a private pool and should be as fast as the pool that the driver is maintaining. I haven't looked at the driver source in any detail...I've instead decided to rewrite it at some point in the future, but haven't had the time + enough interest yet. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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