Date: Thu, 28 Nov 2013 12:53:59 +0000 From: Meny Yossefi <menyy@mellanox.com> To: Marc Olzheim <marcolz@stack.nl>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Cc: Oded Shanoon <odeds@mellanox.com> Subject: RE: UDP traffic, msg size exceeds 9215 Bytes Message-ID: <F2E47A38E4D0B9499D76F2AB8901571A88750102@MTLDAG01.mtl.com> In-Reply-To: <20131128124944.GA15691@zlo.nu> References: <F2E47A38E4D0B9499D76F2AB8901571A8875009F@MTLDAG01.mtl.com> <20131128124944.GA15691@zlo.nu>
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Nope, I wasn't aware of it. It works now. Thanks! -Meny -----Original Message----- From: Marc Olzheim [mailto:marcolz@stack.nl]=20 Sent: Thursday, November 28, 2013 2:50 PM To: Meny Yossefi Cc: freebsd-net@freebsd.org; Oded Shanoon Subject: Re: UDP traffic, msg size exceeds 9215 Bytes On Thu, Nov 28, 2013 at 12:43:43PM +0000, Meny Yossefi wrote: > Hi all, >=20 > We've been running some benchmarks (Netperf, Iperf) on our driver (Mellan= ox), 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. >=20 > We've spotted the same behavior on different vendors which lead us to bel= ieve 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 =3D 9216 bytes... Marc
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