netdev - Re: [PATCH 2/2 net-next] net: move qdisc ingress filtering code where it belongs

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Date:	Mon, 11 May 2015 07:35:12 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	Alexei Starovoitov <ast@...mgrid.com>,
	Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
	davem@...emloft.net, jhs@...atatu.com
Subject: Re: [PATCH 2/2 net-next] net: move qdisc ingress filtering code
 where it belongs

On Mon, 2015-05-11 at 15:32 +0200, Pablo Neira Ayuso wrote:

> My old box is a Intel(R) Core(TM) i5-3320M CPU @ 2.60GHz
> 
> lscpu on debian shows:
> 
> L1d cache:             32K
> L1i cache:             32K
> L2 cache:              256K
> L3 cache:              3072K
> 
> Please, carefully read my patch description. I think you can rebuild
> your work on top of this patch. Thanks.

Yes, I guess even this simple patch could make your box faster maybe.

We might have to add a noinline_for_icache_sake


# size net/core/dev.o net/core/dev.o.after
   text	   data	    bss	    dec	    hex	filename
  57028	   2260	   2864	  62152	   f2c8	net/core/dev.o
  56468	   2260	   2864	  61592	   f098	net/core/dev.o.after

diff --git a/net/core/dev.c b/net/core/dev.c
index 862875ec8f2f30dc39fec7bb6c00c75e202ebeaa..03080ed5e639a938715e6d499949fa1ab12a8908 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1765,7 +1765,7 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
 }
 EXPORT_SYMBOL_GPL(dev_forward_skb);
 
-static inline int deliver_skb(struct sk_buff *skb,
+static noinline int deliver_skb(struct sk_buff *skb,
 			      struct packet_type *pt_prev,
 			      struct net_device *orig_dev)
 {
@@ -3545,7 +3545,7 @@ static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
 	return result;
 }
 
-static inline struct sk_buff *handle_ing(struct sk_buff *skb,
+static noinline struct sk_buff *handle_ing(struct sk_buff *skb,
 					 struct packet_type **pt_prev,
 					 int *ret, struct net_device *orig_dev)
 {


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