Re: [PATCH] support for Cobalt Networks (x86 only) systems (forrealthis

From: Bogdan Costescu (bogdan.costescu@iwr.uni-heidelberg.de)
Date: Fri Jun 01 2001 - 09:30:42 EST

On Fri, 1 Jun 2001, jamal wrote:

> Jeff, Thanks for copying netdev. Wish more people would do that.

Shame on me, I should have thought of that too... I joined lkml only about
2 weeks ago because netdev related topics are sometimes discussed only
there...

> Not really.
>
> One idea i have been toying with is to maintain hysteris or threshold of
> some form in dev_watchdog;

AFAIK, dev_watchdog is right now used only for Tx (if I'm wrong, please
correct me!). So how do you sense link loss if you expect only high Rx
traffic ?

> example: if watchdog timer expires threshold times, you declare the link
> dead and send netif_carrier_off netlink message.
> On recovery, you send netif_carrier_on

I assume that you mean "on recovery" as in "first succesful hard_start_xmit".

> Assumption:
> If the tx path is blocked, more than likely the link is down.

Yes, but is this a good approximation ? I'm not saying that it's not, I'm
merely asking for counter-arguments. 

-- 
Bogdan Costescu

IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: Bogdan.Costescu@IWR.Uni-Heidelberg.De

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