From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Cochran <richardcochran@gmail.com>
Subject: Re: [PATCH net-next 1/2] mlx4_en: Add PTP hardware clock
Date: Wed, 25 Dec 2013 12:53:24 +0100
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Cc: Shawn Bohrer <shawn.bohrer@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Or Gerlitz <ogerlitz@mellanox.com>,
	Amir Vadai <amirv@mellanox.com>, netdev@vger.kernel.org,
	tomk@rgmadvisors.com, Shawn Bohrer <sbohrer@rgmadvisors.com>
To: Hadar Hen Zion <hadarh@mellanox.com>
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On Tue, Dec 24, 2013 at 03:58:06PM +0200, Hadar Hen Zion wrote:
> 
> The spin locks case such a bottleneck since I'm using multiple
> streams in my performance test. RSS mechanism scattered the streams
> between multiple RX rings while each RX ring is bound to a different
> cup.
> The describe scenario cause lock contention between the different RX rings.
> 
> Performance drops from 37.8 Gbits/sec to 32.1 Gbits/sec when spin
> locks are added and goes back to 37.8 Gbits/sec when using
> read/write locks.

And you are time stamping every received packet?

Thanks,
Richard