simple memory malloc and free in ip_output.c

[Valdis.Kletnieks at vt.edu]

On Thu, 02 Jan 2014 12:12:49 +0700, Mulyadi Santosa said:

> Other than what others have said, IMHO it is better to avoid such
> rapid alloc/free, assuming your code fragment is running on every
> packet reception/sending.
>
> Instead, I suggest to allocate the memory before the ip_queue_xmit and
> use-reuse it inside ip_queue_xmit.

Be careful with re-entrancy issues - you'll want a separate instance of memory
for all possible concurrent callers of ip_queue_xmit (you may need one per
active interface, because you can e transmitting packets on multiple interfaces
at the same time).

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