netdev - Re: Regression on TX throughput when using bonding

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Date:	Thu, 14 Jun 2012 11:21:59 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jean-Michel Hautbois <jhautbois@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Regression on TX throughput when using bonding

On Thu, 2012-06-14 at 10:58 +0200, Jean-Michel Hautbois wrote:
> Hi all,
> 
> I have bisected a regression which concerns TX throughput when using bonding.
> I tested only with 10Gbps cards, as it appears when bandwidth need is
> over 1Gbps on my machine.
> I send UDP multicast packets over bonding and observe the tc result.
> 
> When KO :
> $>tc -s -d qdisc show dev eth1
> qdisc pfifo_fast 0: root refcnt 2 bands 3 priomap  1 2 2 2 1 2 0 0 1 1
> 1 1 1 1 1 1
>  Sent 1106527591 bytes 273802 pkt (dropped 306419, overlimits 0 requeues 223)
>  backlog 0b 0p requeues 223
> 
> Ok course, when OK, dropped is 0.
> $>tc -s -d qdisc show dev eth1
> qdisc pfifo_fast 0: root refcnt 2 bands 3 priomap  1 2 2 2 1 2 0 0 1 1
> 1 1 1 1 1 1
>  Sent 1648662087 bytes 408009 pkt (dropped 0, overlimits 0 requeues 0)
>  backlog 0b 0p requeues 0
> 
> 
> Here is the incriminated commit:
> 
> fc6055a5ba31e2c14e36e8939f9bf2b6d586a7f5 is the first bad commit
> commit fc6055a5ba31e2c14e36e8939f9bf2b6d586a7f5

>     net: Introduce skb_orphan_try()

So you are saying that if you make skb_orphan_try() doing nothing, it
solves your problem ?

diff --git a/net/core/dev.c b/net/core/dev.c
index cd09819..6df40dd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2096,6 +2096,7 @@ static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
  */
 static inline void skb_orphan_try(struct sk_buff *skb)
 {
+#if 0
 	struct sock *sk = skb->sk;
 
 	if (sk && !skb_shinfo(skb)->tx_flags) {
@@ -2106,6 +2107,7 @@ static inline void skb_orphan_try(struct sk_buff *skb)
 			skb->rxhash = sk->sk_hash;
 		skb_orphan(skb);
 	}
+#endif
 }
 
 static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)


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