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	2017-08-22 08:30 +0200
Message-ID	<uhaRk-6SH-11@gated-at.bofh.it> (permalink)
References	(1 earlier) <ufVUm-8uR-17@gated-at.bofh.it> <ufXW9-1rk-3@gated-at.bofh.it> <ug5qF-6cp-1@gated-at.bofh.it> <ugnxf-nG-5@gated-at.bofh.it> <ugZCy-7OA-13@gated-at.bofh.it>
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On Mon, Aug 21, 2017 at 06:22:10PM +0000, Vallish Vaidyeshwara wrote:
> AWS Lambda is affected by this change in behavior in
> system call. Following links has more information:
> https://en.wikipedia.org/wiki/AWS_Lambda

Quote:

    Unlike Amazon EC2, which is priced by the hour, AWS Lambda is
    metered in increments of 100 milliseconds.

So I guess you want the accurate timeout in order to support billing?
In any case, even with the old wheel you didn't have guarantees WRT
timeout latency, and so the proper way for the application to handle
this is to use a timerfd together with HIGH_RES_TIMERS, and PREEMPT_RT
in order to have sub-millisecond latency.

Thanks,
Richard

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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