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

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Message-ID: <52BBE9D6.3040006@mellanox.com>
Date:	Thu, 26 Dec 2013 10:33:26 +0200
From:	Hadar Hen Zion <hadarh@...lanox.com>
To:	Richard Cochran <richardcochran@...il.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" <netdev@...r.kernel.org>,
	"tomk@...advisors.com" <tomk@...advisors.com>,
	Shawn Bohrer <sbohrer@...advisors.com>
Subject: Re: [PATCH net-next 1/2] mlx4_en: Add PTP hardware clock

On 12/26/2013 10:26 AM, Hadar Hen Zion wrote:
> On 12/25/2013 1:53 PM, Richard Cochran wrote:
>> 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
>>
>
> Yes, current implementation time stamping every received packet.
> I do think time stamping only packets from the relevant socket will make
> more sense but SIOCSHWTSTAMP ioctl provides only the device without any
> socket attributes.
>
> Thanks,
> Hadar
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Is there a way to time stamping packets per socket?

Thanks,
Hadar
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