Date: Wed, 21 Aug 2002 17:30:48 +0100 (BST) From: Gavin Atkinson <gavin@ury.york.ac.uk> To: <freebsd-stable@freebsd.org> Cc: <dillon@freebsd.org> Subject: mbuf usage - how do i track it down? Message-ID: <Pine.BSF.4.33.0208211647430.22899-100000@ury.york.ac.uk>
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Hi,
I'm having problems on 4.6-STABLE, with running out of mbufs. I have in
the past had problems with running out of mbuf clusters, but have since
upped that from 1024 to 4096 with kern.ipc.nmbclusters="4096" in
/boot/loader.conf. I now find I am running out of mbufs.
endor# netstat -m
16288/16384/16384 mbufs in use (current/peak/max):
16227 mbufs allocated to data
3 mbufs allocated to packet headers
58 mbufs allocated to socket names and addresses
291/1742/4096 mbuf clusters in use (current/peak/max)
7580 Kbytes allocated to network (61% of mb_map in use)
30504 requests for memory denied
9746 requests for memory delayed
12606 calls to protocol drain routines
I have upped it to 32768 with kern.ipc.nmbufs="32768" in
/boot/loader.conf, but as soon as I did that I found I was frequently
getting "No buffer space available" messages while trying to create some
outgoing TCP connections. However, after commenting the line out and
rebooting, i am still getting these messages so they may not be related.
This box is acting as a nat gateway, with an adsl usb mopdem attached, and
an fxp card for the internal network. Currently I have a maximum uptiime
of around 8 days before I need to reboot because of the leaking mbufs.
So how do I find out what is actually allocating these mbufs. Something
seems to be leaking them.
How do I try to debug this? I need to know what is allocating these. The
mbuf(9) man page reffered to in stable doesn't exist, and under current it
doesn't really provide any pointers as to where i should go from here.
I don't really want to just blindly up the number of mbufs, something is
obviously leaking here. I want to solve the problem, by finding out what.
I can give access to this box if needed, it is one ill machine.
Gavin
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