netdev - Re: vxlan/veth performance issues on net.git + latest kernels

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Message-Id: <20131204.013933.873780415547689253.davem@davemloft.net>
Date:	Wed, 04 Dec 2013 01:39:33 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	or.gerlitz@...il.com, joseph.gasparakis@...el.com,
	hkchu@...gle.com, ogerlitz@...lanox.com, edumazet@...gle.com,
	ast@...mgrid.com, pshelar@...ira.com, netdev@...r.kernel.org
Subject: Re: vxlan/veth performance issues on net.git + latest kernels

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 03 Dec 2013 15:59:59 -0800

> On Wed, 2013-12-04 at 01:10 +0200, Or Gerlitz wrote:
> 
>> Samples: 883K of event 'skb:kfree_skb', Event count (approx.): 883406
>> +  97.13%          swapper  [kernel.kallsyms]  [k] net_tx_action
>> +   1.53%            iperf  [kernel.kallsyms]  [k] net_tx_action
>> +   1.03%             perf  [kernel.kallsyms]  [k] net_tx_action
>> +   0.27%      ksoftirqd/7  [kernel.kallsyms]  [k] net_tx_action
>> +   0.03%      kworker/7:1  [kernel.kallsyms]  [k] net_tx_action
>> +   0.00%          rpcbind  [kernel.kallsyms]  [k] net_tx_action
>> +   0.00%          swapper  [kernel.kallsyms]  [k] kfree_skb
>> +   0.00%            sleep  [kernel.kallsyms]  [k] net_tx_action
>> +   0.00%  hald-addon-acpi  [kernel.kallsyms]  [k] kfree_skb
>> +   0.00%            iperf  [kernel.kallsyms]  [k] kfree_skb
>> +   0.00%             perf  [kernel.kallsyms]  [k] kfree_skb
>> 
> 
> Right, I actually have a patch for that, but was waiting for net-next
> being re-opened :
> 
> commit 9a731d750dd8bf0b8c20fb1ca53c42317fb4dd37
> Author: Eric Dumazet <edumazet@...gle.com>
> Date:   Mon Nov 25 13:09:20 2013 -0800
> 
>     net-fixes: introduce dev_consume_skb_any()

I definitely prefer the control block approach to this.
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