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From: Anton Blanchard <anton@samba.org>
To: Michael Neuling <mikey@neuling.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>,
	Paul Mackerras <paulus@samba.org>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/2] powerpc/powernv: Enable POWER8 doorbell IPIs
Date: Tue, 3 Jun 2014 08:06:04 +1000	[thread overview]
Message-ID: <20140603080604.1ab0a86b@kryten> (raw)
In-Reply-To: <1401692223-28337-2-git-send-email-mikey@neuling.org>

Hi,

> This patch enables POWER8 doorbell IPIs on powernv.
> 
> Since doorbells can only IPI within a core, we test to see when we
> can use doorbells and if not we fall back to XICS.  This also enables
> hypervisor doorbells to wakeup us up from nap/sleep via the LPCR
> PECEDH bit.
> 
> Based on tests by Anton, the best case IPI latency between two
> threads dropped from 894ns to 512ns.
> 
> Signed-off-by: Michael Neuling <mikey@neuling.org>

Thanks Mikey!

Tested-by: Anton Blanchard <anton@samba.org>

Anton

  reply	other threads:[~2014-06-02 22:06 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-02  6:57 [PATCH 1/2] powerpc/cpuidle: Only clear LPCR decrementer wakeup bit on fast sleep entry Michael Neuling
2014-06-02  6:57 ` [PATCH 2/2] powerpc/powernv: Enable POWER8 doorbell IPIs Michael Neuling
2014-06-02 22:06   ` Anton Blanchard [this message]
2014-06-04  8:03   ` Michael Ellerman
2014-06-04  9:38     ` Michael Neuling
2014-06-04 11:05     ` [PATCH v2 " Michael Neuling
2014-06-05  3:05 ` [PATCH 1/2] powerpc/cpuidle: Only clear LPCR decrementer wakeup bit on fast sleep entry Preeti U Murthy
  -- strict thread matches above, loose matches on Subject: below --
2014-06-11  5:59 [PATCH 0/2] powerpc/powernv: Enable POWER8 doorbells Michael Neuling
2014-06-11  5:59 ` [PATCH 2/2] powerpc/powernv: Enable POWER8 doorbell IPIs Michael Neuling
2014-06-11  5:59 ` Michael Neuling

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