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?
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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