ia64/xen-unstable

changeset 11083:1d817bfc5ed9

[NET] front: Do not allocate unnecessary page-sized main data area
for receive skbuffs. The bulk data is stored in fragments.
Signed-off-by: Keir Fraser <keir@xensource.com>
author kfraser@localhost.localdomain
date Fri Aug 11 14:22:54 2006 +0100 (2006-08-11)
parents 80f364a5662f
children 9727328c008e
files linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c
line diff
     1.1 --- a/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c	Thu Aug 10 15:51:38 2006 +0100
     1.2 +++ b/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c	Fri Aug 11 14:22:54 2006 +0100
     1.3 @@ -609,9 +609,14 @@ static void network_alloc_rx_buffers(str
     1.4  	 */
     1.5  	batch_target = np->rx_target - (req_prod - np->rx.rsp_cons);
     1.6  	for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) {
     1.7 -		/* Allocate an skb and a page. */
     1.8 -		skb = __dev_alloc_skb(RX_COPY_THRESHOLD,
     1.9 -				      GFP_ATOMIC | __GFP_NOWARN);
    1.10 +		/*
    1.11 +		 * Allocate an skb and a page. Do not use __dev_alloc_skb as
    1.12 +		 * that will allocate page-sized buffers which is not
    1.13 +		 * necessary here.
    1.14 +		 * 16 bytes added as necessary headroom for netif_receive_skb.
    1.15 +		 */
    1.16 +		skb = alloc_skb(SKB_DATA_ALIGN(RX_COPY_THRESHOLD + 16),
    1.17 +				GFP_ATOMIC | __GFP_NOWARN);
    1.18  		if (unlikely(!skb))
    1.19  			goto no_skb;
    1.20