Dear Misc,
I have an issue with growth of UDP syslog outstripping performance of my box.
Am running GENERIC#1368 amd64 as a VM on ESX. It is a task oriented box with
no X/GUI & I can allocate more mem if required.
# netstat -s -p udp
udp:
797597485 datagrams received
0 with incomplete header
0 with bad data length field
30832 with bad checksum
1003 with no checksum
797565479 input packets hardware-checksummed
0 output packets hardware-checksummed
3988 dropped due to no socket
61584 broadcast/multicast datagrams dropped due to no socket
0 dropped due to missing IPsec protection
26521322 dropped due to full socket buffers
770979759 delivered
984188 datagrams output
797115636 missed PCB cache
#
Had a read of http://www.openbsd.org/faq/faq6.html#Tuning. And tried
increasing net.inet.udp.recvspace=9216 -> 65536 which has had little or no
positive impact.
I suspect I am just increasing the size of UDP packet I can receive (which was
probably fine to start with) instead of the total size of the UDP buffer - or
do I need to increase the IP buffer. Can anyone clear this up for me?
Doc at http://www.29west.com/docs/THPM/udp-buffer-sizing.html not openbsd
specific and specifies FreeBSD, Darwin sysctl -w kern.ipc.maxsockbuf=8388608
which is not part of openbsd sysctl but looks to be along the lines of what I
need to do.
V lost in kernel land. Any advice/explanation most welcome. Thx in advance.
IB
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