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

From Richard Cochran <richardcochran@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket
Date 2017-08-18 22:20 +0200
Message-ID <ufVUm-8uR-17@gated-at.bofh.it> (permalink)
References <ufUEV-7yR-13@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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

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Thread

[PATCH RESEND 0/2] enable hires timer to timeout datagram socket Vallish Vaidyeshwara <vallish@amazon.com> - 2017-08-18 21:00 +0200
  [PATCH RESEND 1/2] net: enable high resolution timer mode to timeout datagram sockets Vallish Vaidyeshwara <vallish@amazon.com> - 2017-08-18 21:00 +0200
    Re: [PATCH RESEND 1/2] net: enable high resolution timer mode to  timeout datagram sockets Cong Wang <xiyou.wangcong@gmail.com> - 2017-08-21 22:20 +0200
      Re: [PATCH RESEND 1/2] net: enable high resolution timer mode to  timeout datagram sockets Vallish Vaidyeshwara <vallish@amazon.com> - 2017-08-22 13:20 +0200
  Re: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket Richard Cochran <richardcochran@gmail.com> - 2017-08-18 22:20 +0200
    Re: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket Vallish Vaidyeshwara <vallish@amazon.com> - 2017-08-19 00:30 +0200
      Re: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket Richard Cochran <richardcochran@gmail.com> - 2017-08-19 08:30 +0200
        Re: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket Vallish Vaidyeshwara <vallish@amazon.com> - 2017-08-20 03:50 +0200
          Re: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket Vallish Vaidyeshwara <vallish@amazon.com> - 2017-08-21 20:30 +0200
            Re: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket Richard Cochran <richardcochran@gmail.com> - 2017-08-22 08:30 +0200
              Re: [PATCH RESEND 0/2] enable hires timer to timeout datagram socket Vallish Vaidyeshwara <vallish@amazon.com> - 2017-08-22 13:20 +0200

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