netdev - [RFC net-next PATCH V1 2/9] net: frag cache line adjust inet_frag

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Date:	Fri, 23 Nov 2012 14:08:11 +0100
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Florian Westphal <fw@...len.de>
Cc:	Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Thomas Graf <tgraf@...g.ch>, Cong Wang <amwang@...hat.com>,
	"Patrick McHardy" <kaber@...sh.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Herbert Xu <herbert@...dor.hengli.com.au>
Subject: [RFC net-next PATCH V1 2/9] net: frag cache line adjust
	inet_frag_queue.net

In inet_frag_find() unfortunate cache-line bounces can occur with
struct inet_frag_queue.  As the net pointer (struct netns_frags)
is placed on the same write-often cache-line as e.g. refcnt and
lock. As the hash match check always check (q->net == nf).

This (of-cause) only happens on hash bucket collisions, but as current
hash size is only 64 this makes collisions more likely.

Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
---

 include/net/inet_frag.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 7b897b2..1f75316 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -14,7 +14,6 @@ struct netns_frags {
 
 struct inet_frag_queue {
 	struct hlist_node	list;
-	struct netns_frags	*net;
 	struct list_head	lru_list;   /* lru list member */
 	spinlock_t		lock;
 	atomic_t		refcnt;
@@ -24,6 +23,7 @@ struct inet_frag_queue {
 	ktime_t			stamp;
 	int			len;        /* total length of orig datagram */
 	int			meat;
+	struct netns_frags	*net;
 	u32			creation_ts;/* jiffies when queue was created*/
 	__u8			last_in;    /* first/last segment arrived? */
 

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