Date: Tue, 20 Oct 1998 11:03:59 -0400 From: Steven Yang <syang@directhit.com> To: "'freebsd-questions@freebsd.org'" <freebsd-questions@FreeBSD.ORG> Subject: Can't get rid of my mbufs. Message-ID: <839A86AB6CE4D111A52200104B938D430807E3@MOE>
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Hi, we are running a test on FreeBSD 2.2.6, using Apache 1.2.4 with
FastCGI. We are performing about 100 requests per second over a
high-speed switch. On average, each request returns about 20,000 bytes,
so we are transferring about 2MB/sec. The problem is, our machine ends
up rebooting itself after a couple hours.
Here are some sample outputs after pounding on our machine for over 1
hour:
# netstat -m
4449 mbufs in use:
4437 mbufs allocated to data
1 mbufs allocated to packet headers
7 mbufs allocated to protocol control blocks
4 mbufs allocated to socket names and addresses
4263/4314 mbuf clusters in use
9184 Kbytes allocated to network (98% in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
#netstat -r
Routing tables
Internet:
Destination Gateway Flags Refs Use
Netif Expire
default 10.4.18.1 UGSc 1 0
fxp0
10.4.18/24 link#1 UC 0 0
10.4.18.1 0:10:7b:a6:a6:e8 UHLW 2 0
fxp0 684
moe 0:10:4b:93:8d:43 UHLW 0 43
fxp0 1186
10.4.18.198 0:10:4b:99:c5:e2 UHLW 1 9215795 fxp0
972
localhost localhost UH 0 0
lo0
Symptoms: I can sit around for a long time with no network activity, and
the mbufs won't decrease. If I exceed 10,000 mbuf clusters, I'm in
danger of hitting a server reboot. I can kill Apache, but that doesn't
help. My memory usage increases linearly with increasing mbuf clusters.
mbuf clusters only seem to increase under heavy load.
How do I solve this problem?
Thanks,
Steven
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