Date: Mon, 22 Jan 2001 13:34:01 -0800 From: Mike Smith <msmith@freebsd.org> To: Robert Lipe <robertlipe@usa.net> Cc: Alfred Perlstein <bright@wintelcom.net>, freebsd-hackers@FreeBSD.ORG Subject: Re: contigmalloc, M_WAITOK, & leaks. Message-ID: <200101222134.f0MLY1001413@mass.dis.org> In-Reply-To: Your message of "Mon, 22 Jan 2001 15:14:30 CST." <20010122151430.R10504@rjlhome.sco.com>
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> If busdma is "pretty broken" for network-sized requests, I may just
> avoid it for now, implement the contigmalloc cache, and move on to more
> interesting problems.
It's broken for network-sized requests because it uses contigmalloc. 8)
The cache approach will work equally well for either interface; the
busdma interface is "more correct". At some point, some changes in the
busdma interface will make it possible for you to throw out a lot of code
related to doing s/g for network drivers.
For now, to work around the network interface problem you can just
defragment outbound packets into a single buffer; this is the 'extra
copy' tradeoff you mentioned. Once busdma is fixed, that can go away.
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
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