Date: Wed, 03 Dec 2008 01:18:41 -0800 From: Julian Elischer <julian@elischer.org> To: Alexander Motin <mav@FreeBSD.org> Cc: freebsd-net@freebsd.org, "Vladimir V. Kobal" <vlad@prokk.net> Subject: Re: Multiple netgraph threads Message-ID: <49364EF1.90703@elischer.org> In-Reply-To: <493640A9.8080701@FreeBSD.org> References: <1228234984.00043656.1228222202@10.7.7.3> <493640A9.8080701@FreeBSD.org>
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Alexander Motin wrote: > Hi. > > Vladimir V. Kobal wrote: >> I'm interested in the information of further development of Subject. I have >> a bottleneck: swi_net limited by one CPU core time. There was a thread >> http://lists.freebsd.org/pipermail/freebsd-net/2008-March/017447.html . >> Patch http://people.freebsd.org/~mav/netgraph.threads.patch is not available >> :(. Could somebody mail it to me. Are there any other similar patches? > > I have uploaded that patch back. Not sure is it correct at this moment, > there was some changes, but that time it worked fine. > > I have measured some benefit on my tests with Core2Quad using NetPerf > cluster. But even having all 4 cores busy, I have got just only about > 20% performance benefit on that test setup (routing between three > Gigabit PPTP links). I suppose it was result of constant cache trashing, > when the same netgraph nodes write-accessed by different CPUs. But may > be on more diverse workload, or with some heavy compression/encryption > used benefit can be bigger. > I would like to see this work followed through..
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