small tun(4) improvement

[Andre Oppermann]

Gleb Smirnoff wrote:
> 
>   Collegues,
> 
>   any objections about commiting this improvement to tun(4)?
> In my ng_device I have a similar function ngdwrite(), which was
> cut-n-pasted from tunwrite(). And my tests with a patched ng_device have
> shown 30% speedup on large writes. I don't think it will help tun(4)
> to be a much faster, since tunwrite() isn't a bottleneck, but I think
> it is worth considering. The patch was tested on a production PPPoE access
> concentrator (RELENG_4 however).

Could you check tap(4) as well?  You can do the same optimization there
as well (IIRC).

-- 
Andre