On Thu, 22 Jun 2006, Steven Hartland wrote:
We've just had a box which was subjected to a large amount of small apache
requests once this subsided the response of apache was still very slow. Many
seconds between requests showing in tcpdump and response being returned.
Upon investigation it seemed the number of sockets in teardown / mbufs
allocated might be the cause has anyone else experienced that?
On 5.x SMP systems, there is a known problem in mbuf memory statistics
reporting, which has been corrected in 6.x. The below mbuf counter is
probably a property of that known problem, and is likely unrelated to the
slowdown you have experienced.
Robert N M Watson
Computer Laboratory
University of Cambridge
netstat -m
4294880568 mbufs in use
29885/76800 mbuf clusters in use (current/max)
0/5/6656 sfbufs in use (current/peak/max)
38088 KBytes allocated to network
0 requests for sfbufs denied
0 requests for sfbufs delayed
0 requests for I/O initiated by sendfile
687 calls to protocol drain routines
netstat showed
1 CLOSE_WAIT
6 LAST_ACK
41 FIN_WAIT_1
129 FIN_WAIT_2
295 ESTABLISHED
1083 TIME_WAIT
A restart of apache made no difference a reboot
of the machine was required to return normal
performance.
N.B. 5.4-RELEASE-p8 is in use on the machine in
question.
Steve
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