[ECOS] Re: Out of MBUFS

[Laurie Gellatly]

Hi Grant,
Thanks for the reply. I had seen some of your earlier posts on this.  
Reply below:

On 16/10/2008, at 8:28 AM, Grant Edwards <grante@visi.com> wrote:

> On 2008-10-15, Laurie Gellatly <laurie.gellatly@netic.com> wrote:
>> Hi,
>> I searched the forum but did not find a good answer.
>>
>> I'm using an ecosCentric port for maybe 2 years now. My TCP apps kept
>> running out of sockets so recently I increased the sockets and open
>> files (seems like it needed both to work) and the socket issue seems
>> solved. However, when the system runs for a day or two it no longer
>> responds to network packets. "Out of MBUFs" prints out the serial  
>> port
>> and only a reboot fixes it. The BSD stack does not recover. Can
>> someone point me at a fix I have overlooked/missed.
>
> My first guess is your Ethernet driver has a bug in it and is
> causing an MBUF leak.  For example: under some obscure
> condition, the Ethernet driver never notifies the network stack
> that a particular packet has been sent.  The MBUFs associated
> with that packet will never get free'd, and you eventually run
> out of MBUFs.
>
> Many years ago (eCos 1.3.1), using the old network stack I also
> saw out of MBUF errors occur because of a race condition in the
> network stack.  I have a hard time believing there are too many
> bugs like that left unless you're doing something pretty
> strange.
>
> -- 
> Grant Edwards                   grante             Yow! does your  
> DRESSING
>                                  at               ROOM have enough  
> ASPARAGUS?
>                               visi.com
>
>
> -- 
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> discuss
>
I had not considered that the Ethernet driver might have a problem  
because it had been working for so long without an issue. But maybe it  
was never being stressed - I'll have a look.

         ...Laurie:{)

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