Date: Fri, 20 Mar 2015 10:49:14 +0100 From: =?ISO-8859-1?Q?Olivier_Cochard=2DLabb=E9?= <olivier@cochard.me> To: =?ISO-8859-13?Q?Vaidas_Damo=F0evi=E8ius?= <vd@par.lt> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Troubles with 'em' driver and UDP packets Message-ID: <CA%2Bq%2BTcq8t-YyZysSRFqFUHcHy9PQJkepYoAo2rWNjcqa9YdOHg@mail.gmail.com> In-Reply-To: <7F780FA4-E826-4C83-98CC-549FECEDA35E@par.lt> References: <7F780FA4-E826-4C83-98CC-549FECEDA35E@par.lt>
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On Fri, Mar 20, 2015 at 10:23 AM, Vaidas Damo=C5=A1evi=C4=8Dius <vd@par.lt>= wrote: > Hello, > =E2=80=8BHi, =E2=80=8B > > I have 2 boxes with FreeBSD 10.1-RELEASE/amd64 and "Intel(R) PRO/1000 > Network Connection 7.4.2" NIC's directly connected to each other. I notic= ed > strange problem - I'm loosing small UDP packets under high load. I've tri= ed > to test it with iperf and got the following: > > --- > > vd@v0s4:~ % iperf3 -u -c 1.2.3.4 > Connecting to host 1.2.3.4, port 5201 > [ 4] local 1.2.3.3 port 64254 connected to 1.2.3.4 port 5201 > [ ID] Interval Transfer Bandwidth Total Datagrams > [ 4] 0.00-1.01 sec 120 KBytes 976 Kbits/sec 15 > [ 4] 1.01-2.01 sec 128 KBytes 1.05 Mbits/sec 16 > [ 4] 2.01-3.01 sec 128 KBytes 1.05 Mbits/sec 16 > [ 4] 3.01-4.01 sec 128 KBytes 1.05 Mbits/sec 16 > [ 4] 4.01-5.01 sec 128 KBytes 1.05 Mbits/sec 16 > [ 4] 5.01-6.01 sec 128 KBytes 1.05 Mbits/sec 16 > [ 4] 6.01-7.01 sec 128 KBytes 1.05 Mbits/sec 16 > [ 4] 7.01-8.00 sec 128 KBytes 1.05 Mbits/sec 16 > [ 4] 8.00-9.01 sec 128 KBytes 1.05 Mbits/sec 16 > [ 4] 9.01-10.01 sec 128 KBytes 1.05 Mbits/sec 16 > - - - - - - - - - - - - - - - - - - - - - - - - - > [ ID] Interval Transfer Bandwidth Jitter Lost/Tota= l > Datagrams > [ 4] 0.00-10.01 sec 1.24 MBytes 1.04 Mbits/sec 0.325 ms 0/159 (0%= ) > [ 4] Sent 159 datagrams > > =E2=80=8BThe result display a Lost/Total ratio of 0/159: Where do you see m= issing UDP packets ? By default iperf send only 1 Mbit/sec in UDP mode: I didn't see any problem on these stats. Regards, Olivier =E2=80=8B
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