Date: Thu, 20 Nov 1997 09:15:32 -0500 From: "Gregory, Scott, SrA, SAF/AADXT" <gregorys@af.pentagon.mil> To: "'freebsd-questions@freebsd.org'" <freebsd-questions@freebsd.org> Subject: Mbuf allocation or lack there of Message-ID: <A1D69BFE912ED111A5BB00A0C95DDDDCA1E6@afp1.hq.af.mil>
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I submitted a question to the group a couple of weeks ago about my
system crashing with a " /kernel: Out of mbuf clusters - increase
maxusers! " error. Taking a suggestion from someone on this mailing
list I increased my max users to "maxusers 128" and added
"options NMBCLUSTERS=4096". This kernel has been running for 14
days and I have again gotten the " /kernel: Out of mbuf clusters -
increase maxusers! " error, however my system did not reboot.
The output of netstat -m is:
715 mbufs in use:
351 mbufs allocated to data
357 mbufs allocated to packet headers
6 mbufs allocated to protocol control blocks
1 mbufs allocated to socket names and addresses
334/1136 mbuf clusters in use
2361 Kbytes allocated to network (32% in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
Yesterday this was running 80-90% in use. The number of clusters in use
continues to increase ( xxx/1136 ). Yesterday it only had 984 clusters
which increaseed to 1026 which increased to the current 1136. When I
was running a slightly modified generic kernel netstat -m ouput was:
714 mbufs in use:
685 mbufs allocated to data
23 mbufs allocated to packet headers
5 mbufs allocated to protocol control blocks
1 mbufs allocated to socket names and addresses
683/2318 mbuf clusters in use
4725 Kbytes allocated to network (30% in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
As you can see the mbuf clusters in use was up to 2318.
My questions are:
1. Does the system dynamically allocate mbuf clusters as it needs them?
2. Is there any way to find out what the maximum allocation will be?
3. Did I get the "Out of mbuf clusters" error yesterday because the
system couldn't allocate clusters fast enough or because it reached the
hard limit?
4. Are my kernel settings sufficient?
I am running a web server with 2.2.2-R on a PPro 200, 96 meg RAM. I am
also running Apache 1.2.4 which at times has 200+ clients connected.
If you need more system info please let me know. Any assistance you can
provide is appreciated.
Thanks,
Scott
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