Date: Wed, 6 Jul 2011 14:40:16 -0700 From: YongHyeon PYUN <pyunyh@gmail.com> To: David Christensen <davidch@broadcom.com> Cc: Charles Sprickman <spork@bway.net>, David Christensen <davidch@freebsd.org>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: bce packet loss Message-ID: <20110706214016.GB5559@michelle.cdnetworks.com> In-Reply-To: <5D267A3F22FD854F8F48B3D2B523819385C32D9115@IRVEXCHCCR01.corp.ad.broadcom.com> References: <alpine.OSX.2.00.1107042113000.2407@freemac> <20110706201509.GA5559@michelle.cdnetworks.com> <5D267A3F22FD854F8F48B3D2B523819385C32D9115@IRVEXCHCCR01.corp.ad.broadcom.com>
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On Wed, Jul 06, 2011 at 02:28:19PM -0700, David Christensen wrote: > > You had 282 RX buffer shortages and these frames were dropped. This > > may explain why you see occasional packet loss. 'netstat -m' will > > show which size of cluster allocation were failed. > > However it seems you have 0 com_no_buffers which indicates > > controller was able to receive all packets destined for this host. > > You may host lost some packets(i.e. non-zero mbuf_alloc_failed_count) > > but your controller and system was still responsive to the network > > traffic. > > > > Data sheet says IfHCInBadOctets indicates number of octets received > > on the interface, including framing characters for packets that > > were dropped in the MAC for any reason. > > The IfHcInBadOctets counter says the controller received X bytes > that were bad on the wire (collisions, FCS errors, etc.). A value I thought that too. But other counters such as FCS, FAE, Collisions, Jabbers were all zero. > of 539,369 would equal about 355 frames @ 1518 bytes per frame. > How bad that is really depends on the amount of time the server > was running. The minimum bit-error rate (BER) for 1000Base-T is > 10^-12, so running at line rate you'd expect to see an error very > 1000 seconds according to the following link: > > http://de.brand-rex.com/LinkClick.aspx?fileticket=TFxnnLPedAg%3D&tabid=1956&mid=5686 > > Most vendors design to greater than 10^-12 and you're probably not > running at line rate all the time so you should see fewer errors. > In my testing I can go for days without seeing any errors, but if > you run long enough or have marginal interconnects/cabling the > error rate will rise. > > Dave > >
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