Re: [PATCH net-next] sock: don't enable netstamp for af_unix sockets

On Mon, Oct 26, 2015 at 02:32:59PM +0100, Hannes Frederic Sowa wrote:

On Mon, Oct 26, 2015, at 14:19, Richard Cochran wrote:

quoted

On Mon, Oct 26, 2015 at 01:51:37PM +0100, Hannes Frederic Sowa wrote:

quoted

netstamp_needed is toggled for all socket families if they request
timestamping. But some protocols don't need the lower-layer timestamping
code at all. This patch starts disabling it for af-unix.

What problem is this patch trying to solve?

netstamp_needed is a static-key which enables timestamping code in the
networking stack receive functions for every packet, while it is not
needed for AF_UNIX/LOCAL. So it is merely a small performance
enhancement.

Are there any numbers that show the effect of this enhancement?

Thanks,
Richard