netdev - Allocation of small packets on Rx

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Message-ID: <1324337426.30454.23.camel@pasglop>
Date:	Tue, 20 Dec 2011 10:30:26 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	netdev@...r.kernel.org
Subject: Allocation of small packets on Rx

Hi folks !

For a driver that gets small packets "inline" in the rx descriptors, I
allocate the skb in the rx poll and copy the data to it.

Should I allocate an skb of the just the right size for the packet (+
eventual alignment) or is there any benefit to allocating all skb's the
same size ?

The max size of those "inline" packets is 256 bytes and the driver today
always allocate that. Does that "help" the allocator some way or should
I just allocate what is needed for each packet ?

Cheers,
Ben.

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