Re: Link up wait timeout [was: Bug#537271: netcfg: new version of gateway reachability patch]
[Taking this off-bug]
On Wed, Feb 09, 2011 at 02:52:53AM -0500, Robert Edmonds wrote:
> btw, (unrelated to #537271), it seems to me that 3 seconds is a fairly
> short value for NETCFG_LINK_WAIT_TIME. i'm pretty sure i've seen
> link-up take longer than that on occasion before, depending on NIC
> chipset, switch, autonegotiation latency, etc.
I've been led to believe by people who should know (a Linux netdev
maintainer) that autonegotiation *should* take on the order of 500ms.
> 5 - 10 seconds would be
> a more conservative default, given that there's no penalty if link-up
> occurs before the timeout.
Sure, there's no penalty is link-up occurs, but what about all the people
for whom link-up doesn't occur -- say, because they're on a wireless link,
or their chipset doesn't work right, or it's trying on a link that isn't
actually up? Every delay screws them over more and more.
- Matt
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