Commit cb4dfe56 authored Sep 23, 2010 by Eric Dumazet Committed by David S. Miller Sep 26, 2010

net: skb_frag_t can be smaller on small arches



On 32bit arches, if PAGE_SIZE is smaller than 65536, we can use 16bit
offset and size fields. This patch saves 72 bytes per skb on i386, or
128 bytes after rounding.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c5256c51

include/linux/skbuff.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -129,8 +129,13 @@ typedef struct skb_frag_struct skb_frag_t;

		struct skb_frag_struct {
		struct page *page;
		#if (BITS_PER_LONG > 32) \|\| (PAGE_SIZE >= 65536)
		__u32 page_offset;
		__u32 size;
		#else
		__u16 page_offset;
		__u16 size;
		#endif
		};

		#define HAVE_HW_TIME_STAMP