HEADS UP: zerocopy bpf commits impending

Julian Elischer julian at elischer.org
Mon Mar 17 11:29:51 PDT 2008

Robert Watson wrote:
> On Mon, 17 Mar 2008, Christian S.J. Peron wrote:
>> Just wanted to give a heads up that I plan to start merging the work 
>> located in the zerocopy bpf perforce branch.  We have been working on 
>> this project for about a year now and feel that it is ready to come 
>> into the tree.
>> I will begin to merge hopefully today [assuming nobody has any 
>> concerns] or tommorow.  Zerocopy bpf will be disabled by default, and 
>> can be enabled globally though the use of a sysctl variable. Once the 
>> kernel bits are in and we sort out a couple minor nits in 
>> libpcap+tcpdump, we will be be looking at getting our libpcap patches 
>> committed upstream.  I will post a patch for people to experiment with 
>> in the meantime after the kernel commits are complete.
>> We do not anticipate this will have any effect on existing bpf 
>> consumers like libpcap, tcpdump etc... so if something breaks, it 
>> shouldn't have and we need to know about :) We were pretty careful 
>> about preserving the ABI. The only exception to this is, netstat will 
>> need a recompile because the size of it's bpf stats structure changed.
>> So if there are any objections or concerns, now is the time to raise 
>> them.
> Per previous posts, interested parties can find the slides on the design 
> from the BSDCan 2008 developer summit here:
> http://www.watson.org/~robert/freebsd/2007bsdcan/20070517-devsummit-zerocopybpf.pdf 

with the video of the talk at:


> Robert N M Watson
> Computer Laboratory
> University of Cambridge
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