Date: Wed, 26 Jan 2000 14:38:46 -0800 (PST) From: Doug White <dwhite@resnet.uoregon.edu> To: Kris Kirby <kris@hiwaay.net> Cc: hackers@FreeBSD.ORG Subject: Re: Acceptable MBUF levels? Message-ID: <Pine.BSF.4.21.0001261437100.6474-100000@resnet.uoregon.edu> In-Reply-To: <Pine.BSF.4.10.10001260959560.39881-100000@barricuda.bsd.nws.net>
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On Wed, 26 Jan 2000, Kris Kirby wrote:
>
> I was just pondering recently as to what the acceptable levels of size and
> amount of mbufs in use are. I vaguely seem to recall that if you run out
> of mbufs, the machine will either panic or reboot. My reason for asking is
> simple:
>
> root:ninbox: {13} netstat -m
> 767/1152 mbufs in use:
> 509 mbufs allocated to data
> 258 mbufs allocated to packet headers
> 503/846/1024 mbuf clusters in use (current/peak/max)
When people refer to mbufs, they refer to mbuf clusters, of which there's
a fixed number. The kernel will allocate more mbufs as necessary.
The usual rule of thumb is that the peak should never exceed 75% of the
max mbufs in the system to allow for sufficient overhead in extreme
situations. In this case you're at 80%, so you should probably recompile
your kernel and bump maxusers.
Doug White | FreeBSD: The Power to Serve
dwhite@resnet.uoregon.edu | www.FreeBSD.org
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