Date: Thu, 28 Nov 2013 13:49:44 +0100 From: Marc Olzheim <marcolz@stack.nl> To: Meny Yossefi <menyy@mellanox.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, Oded Shanoon <odeds@mellanox.com> Subject: Re: UDP traffic, msg size exceeds 9215 Bytes Message-ID: <20131128124944.GA15691@zlo.nu> In-Reply-To: <F2E47A38E4D0B9499D76F2AB8901571A8875009F@MTLDAG01.mtl.com> References: <F2E47A38E4D0B9499D76F2AB8901571A8875009F@MTLDAG01.mtl.com>
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On Thu, Nov 28, 2013 at 12:43:43PM +0000, Meny Yossefi wrote: > Hi all, > > We've been running some benchmarks (Netperf, Iperf) on our driver (Mellanox), and witnessed an odd behavior. > We saw that when running UDP traffic with msg size larger than 9215 bytes, it gets dropped for some reason. MTU is 1500. > > We've spotted the same behavior on different vendors which lead us to believe there's some kernel issue that we are missing here. Did you meddle with sysctl net.inet.udp.maxdgram yet ? The default value is 6 * 1536 = 9216 bytes... Marc
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