Re: [Bug] skb truesize does not update properly in many place

Le vendredi 14 octobre 2011 à 07:48 +0200, Eric Dumazet a écrit :

I am now focusing in the TCP pruning effect, that we can see with WIFI
drivers (and also with drivers using a full PAGE to store a 1500 byte
tcp frame), when a single packet loss is happening on a session with
large RTT.

Here is what I am currently testing :

When one SKB has to be queued in out_of_order_queue,
possibly for a long time, try to reduce its truesize (by using
skb_copy_expand()) if skb->truesize is larger than
2*SKB_TRUESIZE(skb->len)

It seems to work very well, and should not happen in fast path.

Stay tuned