Re: [PATCH net V4 2/2] igb: offer a PTP Hardware Clock instead of the timecompare method
From: Richard Cochran <richardcochran@gmail.com>
Date: 2012-03-27 18:34:08
On Mon, Mar 26, 2012 at 08:51:28PM +0000, Keller, Jacob E wrote:
This is about a case where the user does something stupid. (runs the ioctls too fast). It appears that your answer is something like "The user did something stupid, we shouldn't care". My answer is, "we should do what we can to prevent this."
No matter how much you optimize your driver (or library or whatever), there is always some user load that will kill your performance. The locking is need for data integrity. The code path in the lock is short. I doubt there is any serious performance issue here. Richard