Date: Tue, 23 May 1995 17:04:18 +0300 From: Heikki Suonsivu <hsu@clinet.fi> To: davidg@Root.COM Cc: Heikki Suonsivu <hsu@clinet.fi>, freebsd-bugs@freefall.cdrom.com Subject: Re: kern/435: mb_map full, network starts jumping off and on, finally stays down Message-ID: <199505231404.RAA03308@katiska.clinet.fi> In-Reply-To: <199505230836.BAA01926@corbin.Root.COM> References: <199505230820.BAA16953@freefall.cdrom.com> <199505230836.BAA01926@corbin.Root.COM>
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David Greenman writes:
> > P90 as news server plus various other jobs.
> ...
> >May 23 00:00:32 katiska /kernel: mb_map full
> >
> >And network interface starts dropping packets. Occasionally a packet
> >or two gets through, as sometimes nfs says is alive again, and even a
> >login gets though. A couple of hours later the connections die
> >completely.
>
> How many simultaneous TCP connections does the machine typically have, and
Haven't counted, now it is about 40 but we are not at the peak hours yet.
I would guess it stays less 200, probably less than 100 connections. Even
less active connections.
> how many mbuf clusters do you have configured in the kernel?
Haven't changed the number of MBUFs. maxusers is 256.
It still is a problem it the system locks up all IO when mbufs run out, it
probably should panic if a critical resource isn't available, though I can
see that it isn't easy to know when it did run out all of the available
space. But it is the difference between short break and driving 10 miles
down there to reboot the damn thing. Linux is particularly bad in these
things, I have hardly ever seen it panic, it always locks up either IO or
itself, although less often than FreeBSD panics :-(.
--
Heikki Suonsivu, T{ysikuu 10 C 83/02210 Espoo/FINLAND,
hsu@cs.hut.fi home +358-0-8031121 work -4513377 fax -4555276 riippu SN
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