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Date: Fri, 18 Nov 2016 02:37:09 +0200 (EET) From: Julian Anastasov <ja@....bg> To: Rick Jones <rick.jones2@....com> cc: Eric Dumazet <eric.dumazet@...il.com>, Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org, Saeed Mahameed <saeedm@...lanox.com>, Tariq Toukan <tariqt@...lanox.com> Subject: Re: Netperf UDP issue with connected sockets Hello, On Thu, 17 Nov 2016, Rick Jones wrote: > raj@...dy:~/netperf2_trunk$ strace -v -o /tmp/netperf.strace src/netperf -F > src/nettest_omni.c -t UDP_STREAM -l 1 -- -m 1472 > > ... > > socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 4 > getsockopt(4, SOL_SOCKET, SO_SNDBUF, [212992], [4]) = 0 > getsockopt(4, SOL_SOCKET, SO_RCVBUF, [212992], [4]) = 0 > setsockopt(4, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 > bind(4, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("0.0.0.0")}, > 16) = 0 > setsockopt(4, SOL_SOCKET, SO_DONTROUTE, [1], 4) = 0 connected socket can benefit from dst cached in socket but not if SO_DONTROUTE is set. If we do not want to send packets via gateway this -l 1 should help but I don't see IP_TTL setsockopt in your first example with connect() to 127.0.0.1. Also, may be there can be another default, if -l is used to specify TTL then SO_DONTROUTE should not be set. I.e. we should avoid SO_DONTROUTE, if possible. Regards -- Julian Anastasov <ja@....bg>
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