Date: Thu, 24 Apr 2008 10:34:00 +0200 From: Andre Oppermann <andre@freebsd.org> To: Mark Hills <mark@pogo.org.uk> Cc: Peter Jeremy <peterjeremy@optushome.com.au>, freebsd-net@freebsd.org Subject: Re: read() returns ETIMEDOUT on steady TCP connection Message-ID: <481045F8.7090904@freebsd.org> In-Reply-To: <alpine.BSO.1.10.0804240030500.6125@zrgural.vwaro.pbz> References: <alpine.BSO.1.10.0804191437400.21362@zrgural.vwaro.pbz> <20080420025010.GJ73016@server.vk2pj.dyndns.org> <alpine.BSO.1.10.0804201238480.31900@zrgural.vwaro.pbz> <480BBD7E.8010700@freebsd.org> <alpine.BSO.1.10.0804210740100.1745@zrgural.vwaro.pbz> <480C9AC6.8090802@freebsd.org> <480E7901.5000804@freebsd.org> <alpine.BSO.1.10.0804240030500.6125@zrgural.vwaro.pbz>
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Mark Hills wrote: > On Wed, 23 Apr 2008, Andre Oppermann wrote: > >> http://people.freebsd.org/~andre/tcp_output-error-log.diff >> >> Please apply this patch and enable the sysctl net.inet.tcp.log_debug=1 >> and report any output. You likely get some (normal) noise from syncache. >> What we are looking for is reports from tcp_output. > > Hi Andre, I've applied the patch and tested. > > Aside from syncache noise, I get a constant stream of 'error 55' > (ENOBUFS?), once the number of connection gets to around 150 at 192kbps. > > TCP: [192.168.5.43]:52153 to [192.168.5.40]:8080; tcp_output: error 55 > while sending > > 192.168.5.40 is the IP address of this host, running the server. > > I tried to correlate the point of the application receiving ETIMEDOUT > with these messages, but that is tricky as it seems to be outputting a > lot of messages, and multiple messages over eachother (see below). > > Because of the mention of no buffer space available, I checked the > values of net.inet.tcp.sendbuf* and recvbuf*, and increased the max > values with no effect. > > When I get time I will modify the kernel to print errors which aren't > ENOBUFS to see if there are any others. But in the meantime, this sounds > like a problem to me. Is that correct? Yes. I'll investigate why you get ENOBUFS here despite your netstat -m output not showing any request denied. -- Andre > Mark > > > :8080; tcp_output: error 55 while sending > TCP: [192.168.5.42]:57384T CtPo: > [[119922..116688..55..4402]]::85048400;1 ttoc p[_1o9u2t.p1u6t8:. > 5e.r4r0o]r: 8080;5 5t cwp_hoiultep uste:n deirnrgor 55 while sending > TCP: [192.168.5.42]:57382 to [192.168.5.40]:8080; tcp_output: error 55 > while sending > TCP: [192.168.5.42]:57381 to [192.168.5.40]:8080; tcp_output: error 55 > while sending > TCP: [192.168.5.42]:57380 to [192.168.5.40]:8080; tcp_output: error 55 > while sending > > >
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