Alexander Strange wrote:
We're running a rather high-load webserver using FreeBSD
7-RELEASE/amd64/nginx on an Intel em gigabit connection.
Performance is good for our current bandwidth use (about 20Mbit and
~2000 connections/sec at the moment), but a large number of HTTP
requests are being immediately dropped before getting to nginx. I see
complaints about this with earlier versions of FreeBSD -
http://forum.lighttpd.net/topic/171 - but no solutions. Does anyone know
what could be the problem, or anything we could do about it?
There are several other servers running earlier FreeBSDs on i386 which
don't seem to have this problem, but I still haven't ruled out upstream
hardware problems or Sandvine yet.
On the server:
-nginx's error log is full of "accept() failed (53: Software caused
connection abort)", sometimes printing three or four at the same time.
-messages is full of:
Limiting open port RST response from 441 to 200 packets/sec
Limiting open port RST response from 488 to 200 packets/sec
Limiting open port RST response from 399 to 200 packets/sec
Limiting open port RST response from 434 to 200 packets/sec
Limiting open port RST response from 308 to 200 packets/sec
I'm not sure if that's related or not.
It's almost certainly related - in addition to other suggested tuning by
Istvan, set net.inet.icmp.icmplim sysctl to something high - for example
2000 in your case.
Actually, in your sysctl.conf it's set to 400 - you do know you have to
run "/etc/rc.d/sysctl restart" to reaload sysctl.conf?
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