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
next prev parent 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
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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