RE: [PATCH net V4 2/2] igb: offer a PTP Hardware Clock instead of the timecompare method

-----Original Message-----
From: Richard Cochran [mailto:richardcochran@gmail.com]
Sent: Wednesday, March 21, 2012 10:00 AM
To: chetan loke
Cc: netdev@vger.kernel.org; e1000-devel@lists.sourceforge.net; Keller, Jacob
E; Kirsher, Jeffrey T; Ronciak, John; john.stultz@linaro.org;
tglx@linutronix.de
Subject: Re: [PATCH net V4 2/2] igb: offer a PTP Hardware Clock instead of the
timecompare method

Can you please explain how using a seqlock could help here?

Thanks,
Richard

My understanding of the seqlock, is that it prevents starvation of the hwtstamp calls in the rx and tx routines if/when a user hammers the gettime ioctl due to bad software design where 100+ apps are wanting direct access to the PHC.

- Jake