Date: Tue, 17 Apr 2012 16:24:24 -0700 From: Sean Bruno <seanbru@yahoo-inc.com> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: igb(4) Raising IGB_MAX_TXD ?? Message-ID: <1334705064.4486.23.camel@powernoodle-l7.corp.yahoo.com>
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We're running a service with a 82576 configured with 4 queues and a maxed rxd/txd configuration: http://people.freebsd.org/~sbruno/igb_stats.txt We still see, under higher load spikes, a tendency to drop packets (I suspect an application issue at this point, but want to attempt to alleviate some congestion). I note that IGB_MAX_RXD is set to 4k. Reviewing the Intel spec shell on the 82576 I see that the maximum value for the Descriptor Ring Length (8.10.8) is 32k descriptors. Does that mean I should be able to go higher that 4k? I suspect that even if I can, that would merely make the traffic fill more buffer space, but maybe its enough to make it work a bit better. Sean
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