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authorEric Dumazet <eric.dumazet@gmail.com>2011-10-13 07:28:54 +0000
committerDavid S. Miller <davem@davemloft.net>2011-10-13 16:05:07 -0400
commit87fb4b7b533073eeeaed0b6bf7c2328995f6c075 (patch)
treebe4b37f08d7fe2d018ae68bae4577b1b2bafd0fc /net/ipv4/icmp.c
parent97ba0eb64ca690165f945a83e609102fcefa99cb (diff)
net: more accurate skb truesize
skb truesize currently accounts for sk_buff struct and part of skb head. kmalloc() roundings are also ignored. Considering that skb_shared_info is larger than sk_buff, its time to take it into account for better memory accounting. This patch introduces SKB_TRUESIZE(X) macro to centralize various assumptions into a single place. At skb alloc phase, we put skb_shared_info struct at the exact end of skb head, to allow a better use of memory (lowering number of reallocations), since kmalloc() gives us power-of-two memory blocks. Unless SLUB/SLUB debug is active, both skb->head and skb_shared_info are aligned to cache lines, as before. Note: This patch might trigger performance regressions because of misconfigured protocol stacks, hitting per socket or global memory limits that were previously not reached. But its a necessary step for a more accurate memory accounting. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Andi Kleen <ak@linux.intel.com> CC: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/icmp.c')
-rw-r--r--net/ipv4/icmp.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 23ef31baa1a..ab188ae12fd 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -1152,10 +1152,9 @@ static int __net_init icmp_sk_init(struct net *net)
net->ipv4.icmp_sk[i] = sk;
/* Enough space for 2 64K ICMP packets, including
- * sk_buff struct overhead.
+ * sk_buff/skb_shared_info struct overhead.
*/
- sk->sk_sndbuf =
- (2 * ((64 * 1024) + sizeof(struct sk_buff)));
+ sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
/*
* Speedup sock_wfree()