Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1711335

Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant from nohz

From Mike Galbraith <efault@gmx.de>
Newsgroups linux.kernel
Subject Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant from nohz
Date 2017-08-14 20:40 +0200
Message-ID <uesrn-7E5-1@gated-at.bofh.it> (permalink)
References (2 earlier) <udnDs-7se-7@gated-at.bofh.it> <udFqG-1Rz-23@gated-at.bofh.it> <ue2Qh-mC-11@gated-at.bofh.it> <uer2h-6Tj-13@gated-at.bofh.it> <uervj-72Y-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Mon, 2017-08-14 at 13:34 -0400, Luiz Capitulino wrote:
> On Mon, 14 Aug 2017 19:01:09 +0200
> 
> > What is the source of the load balancing inducing such latency when a single
> > task is affine to a CPU? If this is idle load balancing, it is now affine to
> > housekeepers. If this is task wakeup then it's suprising because select_task_rq()
> > is optimized toward single CPU affinity.
> 
> I guess it was idle load balancing, but I don't remember because this
> was a few years ago. I think this might be reproducible without using
> isolcpus=. I'll give it a try shortly and let you know.

idle_balance() can swamp other noise by a couple orders of magnitude,

	-Mike

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-12 16:20 +0200
  Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Luiz Capitulino <lcapitulino@redhat.com> - 2017-08-13 17:20 +0200
    Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-14 19:10 +0200
      Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Luiz Capitulino <lcapitulino@redhat.com> - 2017-08-14 19:40 +0200
        Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Mike Galbraith <efault@gmx.de> - 2017-08-14 20:40 +0200
          Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Frederic Weisbecker <fweisbec@gmail.com> - 2017-08-15 15:10 +0200
            Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Mike Galbraith <efault@gmx.de> - 2017-08-15 17:20 +0200
              Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-08-15 17:40 +0200
                Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Christopher Lameter <cl@linux.com> - 2017-08-15 18:00 +0200
                Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Mike Galbraith <efault@gmx.de> - 2017-08-15 18:00 +0200
                Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Christopher Lameter <cl@linux.com> - 2017-08-16 15:10 +0200
                Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Mike Galbraith <efault@gmx.de> - 2017-08-16 20:10 +0200
                Re: [RFC PATCH 7/9] housekeeping: Use own boot option, independant  from nohz Mike Galbraith <efault@gmx.de> - 2017-08-15 18:00 +0200

csiph-web