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Re: [PATCH 1/7] netpoll: shorten carrier detect timeout

To: Patrick McHardy <kaber@xxxxxxxxx>
Subject: Re: [PATCH 1/7] netpoll: shorten carrier detect timeout
From: Matt Mackall <mpm@xxxxxxxxxxx>
Date: Thu, 10 Mar 2005 20:42:46 -0800
Cc: Jeff Garzik <jgarzik@xxxxxxxxx>, netdev@xxxxxxxxxxx, Jeff Moyer <jmoyer@xxxxxxxxxx>
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On Fri, Mar 11, 2005 at 05:35:05AM +0100, Patrick McHardy wrote:
> Matt Mackall wrote:
> >Ok, on closer inspection, the current logic is: the NIC reports
> >carrier detect nearly instaneously and thus its carrier detect
> >reporting is considered unreliable. Rather than immediately sending
> >packets, we wait for some interval for it to really be up so that the
> >backlog of console messages doesn't get pumped into the bit bucket.
> >
> >So I'm going to change it from "flaky" to "untrustworthy" and add a
> >comment.
> Why don't you trust an instaneously available carrier? Any
> reason to assume there will be false positives?

Because I had reports of people losing all their boot messages until
this logic was added (about a year ago now?). I don't remember which
NICs were implicated, but some apparently report carrier is always

Mathematics is the supreme nostalgia of our time.

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