netdev - Re: [PATCH net-next 1/2] mlx4_en: Add PTP hardware clock

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Message-ID: <20131225115322.GB5378@netboy>
Date:	Wed, 25 Dec 2013 12:53:24 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Hadar Hen Zion <hadarh@...lanox.com>
Cc:	Shawn Bohrer <shawn.bohrer@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>, netdev@...r.kernel.org,
	tomk@...advisors.com, Shawn Bohrer <sbohrer@...advisors.com>
Subject: Re: [PATCH net-next 1/2] mlx4_en: Add PTP hardware clock

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
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