Date: Fri, 09 May 2008 12:02:04 +0200 From: Andre Oppermann <andre@freebsd.org> To: Tim@gebbettco.com 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: <4824211C.9090105@freebsd.org> In-Reply-To: <f0ded2a94e286433785a3e78d40fc2ea@193.189.140.95> References: <4822BABB.4020407@freebsd.org> <f0ded2a94e286433785a3e78d40fc2ea@193.189.140.95>
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Tim Gebbett wrote: > 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: The error seems to be coming from the interface send queue which hits the limit. If you are using em(4) network interface please add this line to loader.conf(5): hw.em.txd=1024 Or even more if problems persist. The maximum is 4096. -- Andre > 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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