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Date: Thu, 22 Mar 2012 07:41:07 +0100 From: Richard Cochran <richardcochran@...il.com> To: chetan loke <loke.chetan@...il.com> Cc: "Keller, Jacob E" <jacob.e.keller@...el.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "e1000-devel@...ts.sourceforge.net" <e1000-devel@...ts.sourceforge.net>, "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>, "Ronciak, John" <john.ronciak@...el.com>, "john.stultz@...aro.org" <john.stultz@...aro.org>, "tglx@...utronix.de" <tglx@...utronix.de> Subject: Re: [PATCH net V4 2/2] igb: offer a PTP Hardware Clock instead of the timecompare method On Wed, Mar 21, 2012 at 05:50:34PM -0400, chetan loke wrote: > > Richard - Intent is to make the readers(get_time) wait (or return last > read value if the seq_counter tripped because you know that this value > was recent) and let the tx/rx path continue. I haven't looked in more > details but as Jake mentioned you will also need to change the way you > read the values(by not using timecounter_read in get_time). I don't get what you guys are saying. How can you avoid the spin lock around the two time register reads? How about a patch or some pseudo code? Thanks, Richard -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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