Date: Fri, 06 Apr 2001 11:31:36 +0400 From: Dmitry Samersoff <dms@wplus.net> To: Bosko Milekic <bmilekic@technokratis.com> Cc: Archie Cobbs <archie@dellroad.org>, Archie Cobbs <archie@packetdesign.com>, freebsd-net@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG Subject: Re: mbuf leak? fxp? Message-ID: <3ACD70D8.3F14CD6@wplus.net> References: <200103312350.f2VNon305299@bubba.packetdesign.com> <200104051718.f35HIcF73652@arch20m.dellroad.org> <20010405194846.A22964@technokratis.com>
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Bosko Milekic wrote:
>
> On Thu, Apr 05, 2001 at 10:18:38AM -0700, Archie Cobbs wrote:
> > Archie Cobbs writes:
> > > I have this machine that starts running out of mbufs every few days
> > > ("looutput: mbuf allocation failed") and then crashes, and was wondering
> > > if anyone else has seen similar behavior...
> > >
> > > For example...
> > >
> > > Yesterday...
> > > $ netstat -m
> > > 461/624/4096 mbufs in use (current/peak/max):
> > > 459 mbufs allocated to data
> > > 2 mbufs allocated to packet headers
> > > 434/490/1024 mbuf clusters in use (current/peak/max)
> > > 1136 Kbytes allocated to network (36% of mb_map in use)
> > > 0 requests for memory denied
> > > 0 requests for memory delayed
> > > 0 calls to protocol drain routines
> > >
> > > Today...
> > > $ netstat -m
> > > 947/1072/4096 mbufs in use (current/peak/max):
> > > 945 mbufs allocated to data
> > > 2 mbufs allocated to packet headers
> > > 920/946/1024 mbuf clusters in use (current/peak/max)
> > > 2160 Kbytes allocated to network (70% of mb_map in use)
> > > 0 requests for memory denied
> > > 0 requests for memory delayed
> > > 0 calls to protocol drain routines
> > >
> > > It appears that something is slowly eating up mbuf clusters.
> > > The machine is on a network with continuous but very low volume
> > > traffic, including some random multicast, NTP, etc. The machine
> > > itself is doing hardly anything at all.
> >
> > Well, my current guess is that this is simply an NMBCLUSTERS problem.
> > I increased NMBCLUSTERS to 8192 and it hasn't happened again yet.
>
> I kind of doubt that, judging simply from the netstat -m outputs
> you have posted above. In niether one is the number of clusters allocated
> meeting the maximum number of allocatable clusters. If it were the case, you
> would likely see some numbers for "requests for memory denied" and/or
> "requests for memory delayed."
> In any case, increasing NMBCLUSTERS to the number you mention is
> not a bad idea.
>
> > This machine has 5 ethernet interfaces, which must be probably more
> > than the default NMBCLUSTERS can handle.
> >
> > I wonder if we should increase the default NMBCLUSTERS, or document
> > somewhere that > 4 interfaces requires doing so?
>
> Well, the way it should be done is that `maxusers' should be
> increased, if anything. `maxusers' automatically tunes NMBCLUSTERS and
> NMBUFS accordingly. Chances are, if you are explicitly declaring
> `NMBCLUSTERS <NO>' in your kernel configuration file, that you are
> actually lowering the number of clusters/mbufs that would otherwise be
> allowed with your given `maxusers' value (unless you have an unreasonably
> low maxusers).
I always increase NMBCLASTERS instead increasing MAXUSER
if I only need more networks, because increasing maxuser
slow down FreeBSD.
I also have a number of problems with modern Intel ethernet cards,
probably (but I'm not sure) FreeBSD 4.2 fxp driver not 100% compatible
with the latest one.
(Intel PRO/100+ Fast Ethernet Controller (82559) on Mother Board)
--
Dmitry Samersoff, dms@wplus.net, ICQ:3161705
http://devnull.wplus.net
* There will come soft rains ...
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