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

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Date:	Tue, 3 Dec 2013 23:30:53 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Or Gerlitz <or.gerlitz@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	Joseph Gasparakis <joseph.gasparakis@...el.com>,
	Jerry Chu <hkchu@...gle.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Pravin B Shelar <pshelar@...ira.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: vxlan/veth performance issues on net.git + latest kernels

On Wed, Dec 04, 2013 at 12:22:08AM +0200, Or Gerlitz wrote:
> On Tue, Dec 3, 2013 at 11:55 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > On Tue, 2013-12-03 at 16:50 -0500, David Miller wrote:
> >
> >> At this point I would use drop monitor to figure out in what context
> >> packets are being dropped on the floor.  There are scripts provided
> >> with the perf tool to utilize it.
> >
> > Most easy way is to do :
> >
> > perf record -e skb:kfree_skb -a -g sleep 10
> 
> some typo here? I tried the perf tool that comes with the net git
> 
> ./perf record -e skb:kfree_skb -a -g sleep 10
> invalid or unsupported event: 'skb:kfree_skb'
> Run 'perf list' for a list of valid events
> 
>  usage: perf record [<options>] [<command>]
>     or: perf record [<options>] -- <command> [<options>]
> 
>     -e, --event <event>   event selector. use 'perf list' to list
> available events

-g takes an optional argument. Reorder the arguments:

perf record -e skb:kfree_skb -g -a sleep 10

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