Date: Mon, 08 Mar 2010 16:45:20 +0200 From: Ian FREISLICH <ianf@clue.co.za> To: pyunyh@gmail.com Cc: current@freebsd.org Subject: Re: dev.bce.X.com_no_buffers increasing and packet loss Message-ID: <E1NoeCu-0006P9-12@clue.co.za> In-Reply-To: <20100305215539.GG14818@michelle.cdnetworks.com> References: <20100305215539.GG14818@michelle.cdnetworks.com> <20100305210435.GF14818@michelle.cdnetworks.com> <20100305184046.GD14818@michelle.cdnetworks.com> <20100305175639.GB14818@michelle.cdnetworks.com> <E1NnVaT-0003Ft-3p@clue.co.za> <E1Nnc4d-0003mB-6e@clue.co.za> <E1Nne0Q-0003uZ-OR@clue.co.za> <E1Nnesz-00040L-AQ@clue.co.za>
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Pyun YongHyeon wrote: > On Fri, Mar 05, 2010 at 11:16:41PM +0200, Ian FREISLICH wrote: > > Pyun YongHyeon wrote: > > > Thanks for the info. Frankly, I have no idea how to explain the > > > issue given that you have no heavy load. > > > > How many cores would be involved in handling the traffic and runnig > > PF rules on this machine? There are 4x > > CPU: Quad-Core AMD Opteron(tm) Processor 8354 (2194.51-MHz K8-class CPU) > > In this server. I'm also using carp extensively. > > > > pf(4) uses a single lock for processing, number of core would have > no much benefit. What's interesting is the effect on CPU utilisation and interrupt generation that net.inet.ip.fastforwarding has: net.inet.ip.fastforwarding=1 interrupt rate is around 10000/s per bce interface cpu 8.0% interrupt net.inet.ip.fastforwarding=0 interrupt rate is around 5000/s per bce interface cpu 13.0% interrupt It also appears to not drop packets, but I'll have to watch it for longer. Ian -- Ian Freislich
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