Re: [RFT PATCH] Delay netroot mounting by 1 second

[Warren Togami <wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On 06/19/2009 10:51 AM, Seewer Philippe wrote:
>
>
> Bill Nottingham wrote:
>> Seewer Philippe (philippe.seewer-omB+W0Dpw2o@public.gmane.org) said:
>>> While testing in our production environment, I discovered
>>> that the time between interface configuration and trying to mount the
>>> nfs root is too short if the dhcp-server provides an mtu. Having to
>>> set a mtu means that netroot
>>> executes 'ip link down', set's the mtu and the does
>>> 'ip link up' again.
>>>
>>> This results in the mount error "No route to host", because
>>> the network equipment has not had enough time to "shake hands". The
>>> patch below adds a sleep 1 after interface configuration, to give the
>>> equipment enough time.
>>
>> Depending on your switch configuration, the time for the switch to start
>> passing traffic again on link bounce couuld be anywhere from 0.1 seconds
>> to 20 seconds...
>
> Quite correct. Up until now I've fared well with adding 1-5 second
> sleeps to my stuff. But yes it could even take longer. Any ideas how to
> solve this better?

Any way to explicitly detect when the link is back?

Warren
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