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

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Message-Id: <20131203.165034.1085515763685633822.davem@davemloft.net>
Date:	Tue, 03 Dec 2013 16:50:34 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	or.gerlitz@...il.com
Cc:	eric.dumazet@...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: Or Gerlitz <or.gerlitz@...il.com>
Date: Tue, 3 Dec 2013 23:36:50 +0200

> I also thought that under veth there's contention point which could
> explain why packets are dropped, but haven't found it.

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.

I suspect what you will find is that either the cpu is at %100, or
sporadic events where GRO is not performed is killing the stream.
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