udhcpc: dont use BPF filter, users report problems (bugs 4598, 6746), commit e4785ca653d0e219926692c229673b2c1b8d6ac4

[Cristian Ionescu-Idbohrn]

On Tue, 4 Feb 2014, Cristian Ionescu-Idbohrn wrote:
>
> The backside of this, IIRC, is that udhcpc will eat up huge chunks of
> CPU parsing "uninteresting" packets, on "heavy" loaded networks.
>
> Bug #6746 names "FRITZ!Box 7570 router (mipsel)" and some unnamed
> kernel version that "Apparently my kernel does not support this filter
> feature".
>
> Maybe a better alternative would be to either enable the "filter
> kernel feature" (witch will not only benefit busybox, but the whole
                   ^^^^^
                   that's supposed to spell 'which", instead

> system) or to make the BPF filtering a configurable busybox feature.
> That way noone would need to patch the udhcpc source.
>
> See also the kernel source:
>
> 	Documentation/networking/filter.txt


Cheers,

-- 
Cristian