Commit-ID: 1395807091300b84789316cad2a9142b58f9092a Gitweb: http://git.kernel.org/tip/1395807091300b84789316cad2a9142b58f9092a Author: Alexander Duyck <alexander.h.duyck@xxxxxxxxx> AuthorDate: Thu, 19 Aug 2010 13:37:21 +0000 Committer: David S. Miller <davem@xxxxxxxxxxxxx> CommitDate: Thu, 19 Aug 2010 16:44:22 -0700 ixgbe: bump PS header size to 512 bytes Bump the header size for packet split to 512 bytes since this makes the best use of the 1k buffer that is allocated for any skb 512 bytes or smaller. Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> --- drivers/net/ixgbe/ixgbe.h | 13 +++++++++---- 1 files changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h index 9e15eb9..7233fef 100644 --- a/drivers/net/ixgbe/ixgbe.h +++ b/drivers/net/ixgbe/ixgbe.h @@ -69,15 +69,20 @@ #define IXGBE_MAX_FCPAUSE 0xFFFF /* Supported Rx Buffer Sizes */ -#define IXGBE_RXBUFFER_64 64 /* Used for packet split */ -#define IXGBE_RXBUFFER_128 128 /* Used for packet split */ -#define IXGBE_RXBUFFER_256 256 /* Used for packet split */ +#define IXGBE_RXBUFFER_512 512 /* Used for packet split */ #define IXGBE_RXBUFFER_2048 2048 #define IXGBE_RXBUFFER_4096 4096 #define IXGBE_RXBUFFER_8192 8192 #define IXGBE_MAX_RXBUFFER 16384 /* largest size for a single descriptor */ -#define IXGBE_RX_HDR_SIZE IXGBE_RXBUFFER_256 +/* + * NOTE: netdev_alloc_skb reserves up to 64 bytes, NET_IP_ALIGN mans we + * reserve 2 more, and skb_shared_info adds an additional 384 bytes more, + * this adds up to 512 bytes of extra data meaning the smallest allocation + * we could have is 1K. + * i.e. RXBUFFER_512 --> size-1024 slab + */ +#define IXGBE_RX_HDR_SIZE IXGBE_RXBUFFER_512 #define MAXIMUM_ETHERNET_VLAN_SIZE (ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN) -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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