Date: Thu, 8 May 2008 12:26:44 +0100 From: Tim Gebbett <tim@gebbettco.com> To: Andre Oppermann <andre@freebsd.org> Cc: freebsd-net@freebsd.org, Deng XueFeng <dengxf@gmail.com>, Mark Hills <mark@pogo.org.uk> Subject: Re: read() returns ETIMEDOUT on steady TCP connection Message-ID: <f0ded2a94e286433785a3e78d40fc2ea@193.189.140.95> In-Reply-To: <4822BABB.4020407@freebsd.org> References: <4822BABB.4020407@freebsd.org>
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Hi all, applied the patch, Well before a ETIMEDOUT error occurred (around 60secs), the tcp debug started venting massive quantities of tcp_output error 55 while sending with syncache noise: y 8 12:14:26 timtest kernel: :63859 to [192.168.5.40]:80; tcp_output: error 55 whilTeC Ps:e n[d1i9n2g. 1(6i8p._5o.u4t3p]u:t64 0371 )t May 8 12:14:26 timtest kernel: o May 8 12:14:26 timtest kernel: [192.168.5.40]:80; tcp_output: error 55 while sendingT May 8 12:14:26 timtest kernel: C May 8 12:14:26 timtest kernel: P: [192.168.5.43]:63859 to [192.168.5.40]:80; tcp_output: error 55 while sending May 8 12:14:26 timtest kernel: TCP: [192.168.5.43]:64037 to [192.168.5.40]:80; tcp_output: error 55 while sending (ip_output 1) May 8 12:14:26 timtest kernel: TCP: [192.168.5.43]:64037 to [192.168.5.40]:80; tcp_output: error 55 while sending May 8 12:14:26 timtest kernel: TCP: [192.168.5.43]:63857 to [192.168.5.40]:80; tcp_output: error 55 while sending (ip_output 1) May 8 12:14:26 timtest kernel: TCP: [192.168.5.42]:56421 toT C[P1:9 2[.119628..51.6480.]5:.8403;] :6t3c8p57_ otuot p[u1t9:2 .e1r68r.o5r. 40]:8505; whticlpe_ osuetnpduitn:g e(rirpo_ro utpu5t5 w1h)i interspersed with clean blocks of 20 entries or so of: May 8 12:14:26 timtest kernel: TCP: [192.168.5.43]:64037 to [192.168.5.40]:80; tcp_output: error 55 while sending (ip_output 1) May 8 12:14:26 timtest kernel: TCP: [192.168.5.43]:64037 to [192.168.5.40]:80; tcp_output: error 55 while sending May 8 12:14:26 timtest kernel: TCP: [192.168.5.43]:63857 to [192.168.5.40]:80; tcp_output: error 55 while sending (ip_output 1) The output did not look appreciably different when the ETIMEDOUT occurred. On stopping the client test program: May 8 12:14:46 timtest kernel: TCP: [192.168.5.43]:63978 to [192.168.5.40]:80 tcpflags 0x4<RST>; syncache_chkrst: Spurious RST without matching syncache entry (possibly syncookie only), segment ignored May 8 12:14:46 timtest kernel: TCP: [192.168.5.43]:63978 to [192.168.5.40]:80 tcpflags 0x4<RST>; syncache_chkrst: Spurious RST without matching syncache entry (possibly syncookie only), segment ignored May 8 12:14:46 timtest kernel: TCP: [192.168.5.43]:63978 to [192.168.5.40]:80 tcpflags 0x4<RST>; syncache_chkrst: Spurious RST without matching syncache entry (possibly syncookie only), segment ignored netstat -m 258/11007/11265 mbufs in use (current/cache/total) 256/1596/1852/25600 mbuf clusters in use (current/cache/total/max) 256/1536 mbuf+clusters out of packet secondary zone in use (current/cache) 0/7585/7585/51200 4k (page size) jumbo clusters in use (current/cache/total/max) 0/0/0/6400 9k jumbo clusters in use (current/cache/total/max) 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max) 576K/36283K/36860K bytes allocated to network (current/cache/total) 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) 0/0/0 requests for jumbo clusters denied (4k/9k/16k) 0/4/6656 sfbufs in use (current/peak/max) 0 requests for sfbufs denied 0 requests for sfbufs delayed 0 requests for I/O initiated by sendfile 0 calls to protocol drain routines Thanks again for your help - Tim
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