Subject: Re: ti0: mbuf allocation failed -- packet dropped!
To: Markus W Kilbinger <>
From: Manuel Bouyer <>
List: current-users
Date: 09/15/2002 15:45:12
On Sun, Sep 15, 2002 at 12:55:15PM +0200, Markus W Kilbinger wrote:
> Hi!
> Now it's the third time that one of our NetBSD/i386 machine (running
> 1.6_RCx, now 1.6 release) hangs up while displaying the above message
> in an endless loop.
> NIC is (mac part. anonymous :-)):
>   ti0 at pci0 dev 9 function 0: Netgear GA620 1000BASE-SX Ethernet (rev. 0x01)
>   ti0: interrupting at irq 15
>   ti0: Ethernet address: 00:02:e3:xx:xx:xx
> which is running fine, otherwise.
> I already increased NMBCLUSTERS:
>   options         NMBCLUSTERS=16384
> The machine is a nfs/web server, but these hang ups occurred randomly
> without being correlated to any severe load or network traffic.
> - How to avoid these hangs? Further NMBCLUSTERS increase?

No, it's not an NMBCLUSTERS issue. It's running out of mbuf headers.
Does unplugging the network stop the message stream ?
Can you log in when this happens ? If so, maybe use netstat and vmstat
to try to find what's using that much mbufs.

> - Should these error messages ever appear (== bug)?

There can always be memory shortage. However in your case it looks like
something doesn't release memory ...

Manuel Bouyer <>