Date: Sat, 5 Feb 2005 01:53:54 +0200 From: Ruslan Ermilov <ru@freebsd.org> To: Guy Helmer <ghelmer@palisadesys.com> Cc: freebsd-net@freebsd.org Subject: Re: Netgraph performance question Message-ID: <20050204235354.GB95344@ip.net.ua> In-Reply-To: <4203EC87.3070504@palisadesys.com> References: <4203AAE3.4090906@palisadesys.com> <20050204204804.GC71363@ip.net.ua> <4203EC87.3070504@palisadesys.com>
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[-- Attachment #1 --] On Fri, Feb 04, 2005 at 03:43:35PM -0600, Guy Helmer wrote: > > I'm sorry, I mis-wrote. My ng_tee is actually modified to only passes > packets to the r2l/l2r hooks if they are connected, otherwise packets are > passed directly to the left/right hooks (so it's an optional divert), so > there is no m_dup anymore in my modified ng_tee. > > I assumed that the bridging and trip through userland would only add > latency to the connection, but the result of the performance test seemed > to indicate that there is either a bottleneck I need to solve or my > testing methodology was flawed. > If you pass packets through userland, then it is even more performance penalty, as it involves userspace<->kernel copying, twice for each packet. Cheers, -- Ruslan Ermilov ru@FreeBSD.org FreeBSD committer [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFCBAsSqRfpzJluFF4RAqcOAJ92ljJSEZuaCfl/8ctSiwHDYPtSjwCfR2iy LcGhfyrptuZdWkskbonwoDo= =YWuj -----END PGP SIGNATURE-----
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