On 12/5/07, Robert Watson <[EMAIL PROTECTED]> wrote: > > On Wed, 5 Dec 2007, Robert Watson wrote: > > > On Wed, 5 Dec 2007, Vlad GALU wrote: > > > >> I would like to try the aforementioned patches too. Can you please point me > >> to a link? > > > > You can download our experimental tarball from here: > > > > http://www.watson.org/~robert/freebsd/20071103-zcopybpf.tgz > > > > You can find a BSDCan quick talk on the topic here: > > > > http://www.watson.org/~robert/freebsd/2007bsdcan/20070517-devsummit-zerocopybpf.pdf > > > > I've had several reports of significantly improved packet capture rates at > > high speeds with it, but it's not yet in the tree because we feel it needs > > more evaluation and review. I hope to ship some form of zero-copy BPF > > buffer support in FreeBSD 8, and possibly even MFC it. Any feedback you > > might have would be most helpful. > > Having sent you the patch, I should have let you know that you'll need to: > > - Add options BPF_ZEROCOPY to your kernel configuration to enable the > zero-copy buffering mode. > > - Make sure the kernel and libpcap are rebuild following the application of > the patch and dropping in the tarball. > > - setenv BPF_ZERO_COPY before running tcpdump or other BPF-based tools to > enable the zero-copy buffer mode. > > The patch includes both kernel changes (abstract the buffer model, add a new > buffer model) and user space changes (updated libpcap to speak the new model, > selected right now with the environmental variable). Presumably if merged, > zero-copy BPF buffers would be used by default via libpcap if present in the > kernel, but right now this is all for evaluation purposes.
Thanks, Robert! I'll start running a few tests next week, I'm waiting for some hardware to arrive first. > > Robert N M Watson > Computer Laboratory > University of Cambridge > -- Mahnahmahnah! _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
