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VanLUG Email Archive

Re: Portability of Linux

Ted Powell
Fri, 28 Aug 1998 12:16:58 -0700

On Fri, Aug 28, 1998 at 11:47:39AM -0700, Curt Sampson wrote:
> On Fri, 28 Aug 1998, Ted Powell wrote:
> [...]
> > IP: always defragment
> > CONFIG_IP_ALWAYS_DEFRAG
>
> No, this just determines whether fragments are reassembled in
> unusual circumstances. My complaint is not about that, but about
> the fact that when you do any reassembly (either for this option,
> or because the fragments you received were destined to your machine)
> you do a full (and unnecessary) copy of the data.

You've inspired me to go digging. The comment on the routine that does
the deed, ip_glue, is (for those who haven't already seen it):

/*
* Build a new IP datagram from all its fragments.
*
* FIXME: We copy here because we lack an effective way of handling lists
* of bits on input. Until the new skb data handling is in I'm not going
* to touch this with a bargepole.
*/

(from /usr/src/linux-2.0.34/net/ipv4/ip_fragment.c, lines 325+)

-- 




  http://psg.com/~ted/  (Ted Powell)
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