Re: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket

On Fri, Aug 18, 2017 at 06:44:08PM +0000, Vallish Vaidyeshwara wrote:

There has been a behavior change in 4.9 kernel with refactoring of Kernel
timer wheel in 4.8. We have a use case wherein our datagram socket
application is sensitive to socket timeout including long timeouts.

One of the test runs with a timeout value of 180 seconds timed out at
190 seconds.

So the whole premise of the new timer wheel is that long timeouts need
not be very accurate.

Patch 1: Has core code change of enabling hires timer to timeout datagram
	 socket on AF_UNIX and AF_INET domain

Using hrtimers will hurt performance for most applications.  Can you
please explain your use case and why is it so important?

Thanks,
Richard