From: k@vodka.home.kg
To: wireguard@lists.zx2c4.com
Subject: [WireGuard] heavy packet loss
Date: Fri, 4 Nov 2016 19:01:40 +0300 [thread overview]
Message-ID: <1518389796.20161104190140@vodka.home.kg> (raw)
I'm trying to connect 2 endpoints with wireguard.
One endpoint has MTU of inet inteface 1500, another 1456.
To prevent packet fragmentation on inet interface i set up mtu 1383 for both wg interfaces. Checked that no frag occurs on inet interface in wireshark. Maximum packet data size is 1383-28 = 1355. Checked with no-fragment ping, packets pass well.
First I checked packet loss between inet IPs
iperf -c x.x.x.x -u -b 25M -l 1400
0.0-10.3 sec 29.6 MBytes 24.2 Mbits/sec 16.073 ms 175/23090 (0.76%)
packet loss always within 0.5..1%. its normal
now I try to do the same with much less bandwidth between wireguard ips
on packet size <=1252 packet loss rate is 0.5..1%
iperf -c 192.168.254.65 -w 500000 -u -b 1M -l 1252
0.0-10.0 sec 1.18 MBytes 991 Kbits/sec 0.659 ms 9/ 1000 (0.9%)
but starting from packet size 1253 packets loss greatly increases. its 6..10%
iperf -c 192.168.254.65 -w 500000 -u -b 1M -l 1253
0.0-10.0 sec 1.12 MBytes 936 Kbits/sec 0.328 ms 64/ 998 (6.4%)
Thats why TCP is incredibly slow. If I set up mss for TCP to not exceed packets size threshold TCP is fast.
next reply other threads:[~2016-11-04 16:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-04 16:01 k [this message]
2016-11-04 16:04 ` Jason A. Donenfeld
2016-11-04 16:18 ` k
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