linux-kernel - Re: [PATCH RT 0/6] Linux 3.14.48-rt49-rc1

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Date:	Sat, 8 Aug 2015 19:23:46 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	<linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	John Kacur <jkacur@...hat.com>
Subject: Re: [PATCH RT 0/6] Linux 3.14.48-rt49-rc1

On Sat, 8 Aug 2015 19:10:17 -0400
Paul Gortmaker <paul.gortmaker@...driver.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
> >

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