On Fri, Jan 13, 2017 at 12:14 PM, Eric Dumazet <eduma...@google.com> wrote: > > On Fri, Jan 13, 2017 at 9:07 AM, Alexey Kodanev > <alexey.koda...@oracle.com> wrote: > > Hi Eric, > > On 13.01.2017 18:35, Eric Dumazet wrote: > > >> Care to send a packetdrill test so that we have a clear picture of what > >> is going on ? > > > > Is it capable of making two connections in the single test, one after > > another? > > Absolutely. > > Neal, Yuchung would you be kind enough to send a Fastopen tpacketdrill > template showing a typical fastopen test > running on an upstream kernel ? > > Thanks !
Sure, here is an example packetdrill script, IIRC written by Yuchung, which demonstrates TCP fast open and consecutive active connections: `sysctl -q net.ipv4.tcp_timestamps=0` // Cache warmup: send a Fast Open cookie request 0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0 sendto(3, ..., 0, MSG_FASTOPEN, ..., ...) = -1 EINPROGRESS (Operation is now in progress) +0 > S 0:0(0) <mss 1460,nop,nop,sackOK,nop,wscale 8,FO,nop,nop> +.010 < S. 123:123(0) ack 1 win 5840 <mss 1040,nop,nop,sackOK,nop,wscale 6,FO abcd1234,nop,nop> +0 > . 1:1(0) ack 1 +0 close(3) = 0 +0 > F. 1:1(0) ack 1 +.010 < F. 1:1(0) ack 2 win 92 +0 > . 2:2(0) ack 2 // // TEST1: Servers sends SYN-ACK with data and another two data packets // +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4 +0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0 sendto(4, ..., 1000, MSG_FASTOPEN, ..., ...) = 1000 +0 > S 0:1000(1000) <mss 1460,nop,nop,sackOK,nop,wscale 8,FO abcd1234,nop,nop> +.010 < S. 1000000:1001400(1400) ack 1001 win 5840 <mss 1040,nop,nop,sackOK,nop,wscale 6> +0 < . 1401:2801(1400) ack 1001 win 257 +0 < P. 2801:3001(200) ack 1001 win 257 neal
