From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: k@vodka.home.kg Received: from mail.kotidze.in (mail.kotidze.in [91.92.66.82]) by krantz.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 4c77675b for ; Fri, 4 Nov 2016 16:17:00 +0000 (UTC) Received: from private.domain by mail.kotidze.in with [XMail 1.27 ESMTP Server] id for from ; Fri, 4 Nov 2016 19:18:21 +0300 Date: Fri, 4 Nov 2016 19:18:15 +0300 From: k@vodka.home.kg Message-ID: <1859699461.20161104191815@vodka.home.kg> To: "Jason A. Donenfeld" In-Reply-To: References: <1518389796.20161104190140@vodka.home.kg> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Cc: WireGuard mailing list Subject: Re: [WireGuard] heavy packet loss List-Id: Development discussion of WireGuard List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Problematic version was 0.0.20161025. I upgraded kmod to 0.0.20161103 at it works fine now. > Hi k, > I'll look into this. Which snapshot are you using? Or, which commit is th= is? > Jason > On Fri, Nov 4, 2016 at 5:01 PM, wrote: >> 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 wiresh= ark. Maximum packet data size is 1383-28 =3D 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 <=3D1252 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. >> >> _______________________________________________ >> WireGuard mailing list >> WireGuard@lists.zx2c4.com >> http://lists.zx2c4.com/mailman/listinfo/wireguard --=20 =D0=A1 =D1=83=D0=B2=D0=B0=D0=B6=D0=B5=D0=BD=D0=B8=D0=B5=D0=BC, K mailto:k@vodka.home.kg