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| author |   Eric Dumazet <eric.dumazet@gmail.com> | 2010-09-23 05:06:54 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2010-09-26 18:31:13 -0700 |
| commit | cb4dfe562cac6fcb544df752e40c1d78000d0712 (patch) | |
| tree | a256abb0ecbfb4c1909563274ee9e7d0138b1b16 | |
| parent | net: propagate NETIF_F_HIGHDMA to vlans (diff) | |
| download | linux-dev-cb4dfe562cac6fcb544df752e40c1d78000d0712.tar.xz linux-dev-cb4dfe562cac6fcb544df752e40c1d78000d0712.zip | |
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>
| -rw-r--r-- | include/linux/skbuff.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index b2c41d19735c..0b53c43ac92e 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -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 |