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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