From: Steven Rostedt <rostedt@goodmis.org>
To: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: <linux-kernel@vger.kernel.org>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Carsten Emde <C.Emde@osadl.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
John Kacur <jkacur@redhat.com>
Subject: Re: [PATCH RT 0/6] Linux 3.14.48-rt49-rc1
Date: Sat, 8 Aug 2015 19:23:46 -0400 [thread overview]
Message-ID: <20150808192346.740ece60@grimm.local.home> (raw)
In-Reply-To: <20150808231017.GG5998@windriver.com>
On Sat, 8 Aug 2015 19:10:17 -0400
Paul Gortmaker <paul.gortmaker@windriver.com> wrote:
> So we took 20 IRQs in 5s, or 4/s ; not quite the 1/s minimum, but definitely not
> the HZ/s we'd get w/o NOHZ_FULL. Re-running it got consistently 18-20 IRQ / 5s.
OK, so NO_HZ_FULL still isn't great on -rt, but this shows that it
keeps disturbances much lower than without it.
Thanks for the report!
-- Steve
>
> I specifically did NOT unplug and replug cores to "clean" them of tasks; the
> hotplug code just seems to unstable for that from what I've seen in the past,
> and by the looks of the irq counts above, there was no need to either.
>
> The rootfs was basically a ubu 14.10 server install (no X11/gfx) -- not that
> it should matter - so long as other tasks weren't running on the nohz cores.
>
> Paul.
> --
>
> >
> > Enjoy,
> >
> > -- Steve
> >
next prev parent reply other threads:[~2015-08-08 23:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-06 22:17 Steven Rostedt
2015-08-06 22:17 ` [PATCH RT 1/6] Revert "slub: delay ctor until the object is requested" Steven Rostedt
2015-08-06 22:17 ` [PATCH RT 2/6] mm/slub: move slab initialization into irq enabled region Steven Rostedt
2015-08-06 22:17 ` [PATCH RT 3/6] x86-Tell-irq-work-about-self-IPI-support-3.14 Steven Rostedt
2015-08-06 22:17 ` [PATCH RT 4/6] xfs: Disable percpu SB on PREEMPT_RT_FULL Steven Rostedt
2015-08-06 22:17 ` [PATCH RT 5/6] powerpc/kvm: Disable in-kernel MPIC emulation for PREEMPT_RT_FULL Steven Rostedt
2015-08-06 22:17 ` [PATCH RT 6/6] Linux 3.14.48-rt49-rc1 Steven Rostedt
2015-08-08 23:10 ` [PATCH RT 0/6] " Paul Gortmaker
2015-08-08 23:23 ` Steven Rostedt [this message]
2015-08-09 0:06 ` Paul Gortmaker
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