Date: Thu, 12 Oct 2000 07:15:02 -0400 (EDT) From: Chris BeHanna <behanna@zbzoom.net> To: FreeBSD-Stable <stable@freebsd.org> Subject: mbuf leakage on 4.1.1-STABLE Message-ID: <Pine.BSF.4.21.0010120659090.554-100000@topperwein.dyndns.org>
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I posted a week or two ago about my machine wedging every couple
of days, and seeing RX packet drop messages due to no memory
available in /var/log/messages. Specifically, the messages were
"dhclient: send_packet: No buffer space available
/kernel: xl0: no memory for rx list -- packet dropped!"
repeated thousands of times.
Sean O'Connell pointed me in the right direction, stating that
this looked like an mbuf starvation problem. I've been checking my
system constantly via netstat -m, and it looks like I'm leaking mbufs
(mbufs in use and mbuf clusters in use increase until they hit their
limit, then the machine freezes, waiting, I suppose, for an mbuf to
become available). I've taken an interim measure of doubling the
number of NMBCLUSTERS in my kernel, but that just puts off the
inevitable. I end up rebooting when I'm at 80% mbuf cluster usage, so
that I can avoid having to fsck my disks when the machine wedges and I
have to hit the button.
A friend of mine suggested that I instrument mbuf.h and
uipc_mbuf.c so that I could see where all of the allocs and frees
occur. I've looked through these files, and it's not immediately
obvious to me just how I'd instrument them to do that (e.g., __FILE__
and __LINE__ obviously can't be used).
For reference, I'm running 4.1.1-STABLE, cvsup'ed early on October
4th or late on October 3rd, and my NIC is a 3Com 3C905B. I've been
seeing this problem for some time now, but it's gotten a lot worse
recently, and I'm given to understand that it could be just about
anywhere in the protocol stack, not necessarily in the xl driver.
I am willing to do some work to debug this, but never having been
a kernel hacker, I need a little bit of guidance.
Help! My Linux-using co-workers are really giving me the business
over this!
Thanks,
--
Chris BeHanna
Software Engineer (at yourfit.com)
behanna@zbzoom.net
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