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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Dave Liu <r63238@freescale.com>
Cc: ppc-dev <linuxppc-dev@ozlabs.org>,
	Paul Mackerras <paulus@samba.org>,
	Kumar Gala <galak@gate.crashing.org>
Subject: Re: fsl booke MM vs. SMP questions
Date: Wed, 23 May 2007 13:08:56 +1000	[thread overview]
Message-ID: <1179889736.32247.893.camel@localhost.localdomain> (raw)
In-Reply-To: <1179887929.3656.2.camel@localhost.localdomain>

On Wed, 2007-05-23 at 10:38 +0800, Dave Liu wrote:
> On Wed, 2007-05-23 at 08:42 +1000, Benjamin Herrenschmidt wrote:
> 
> > The IPIs should be buffered by the PIC ... delivered only once but
> 
> but what is the buffer depth for IPIs in the PIC?

One :-)

You never "loose" IPIs in the sense that you always get at least 1
interrupt for N IPIs and it's up to software to make sure not to lose
any event. The linux kernel arch code usually handles that with a
synchronous IPI mecanism.

Ben.

  reply	other threads:[~2007-05-23  3:09 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-05-21  7:06 fsl booke MM vs. SMP questions Benjamin Herrenschmidt
     [not found] ` <1179741447.3660.7.camel@localhost.localdomain>
     [not found]   ` <1179742083.32247.689.camel@localhost.localdomain>
2007-05-21 11:37     ` Dave Liu
2007-05-21 22:07       ` Benjamin Herrenschmidt
2007-05-22  3:09         ` Benjamin Herrenschmidt
2007-05-22 10:56           ` Dave Liu
2007-05-22 22:42             ` Benjamin Herrenschmidt
2007-05-23  2:38               ` Dave Liu
2007-05-23  3:08                 ` Benjamin Herrenschmidt [this message]
2007-05-28  9:05                   ` Liu Dave-r63238
2007-05-28  9:24                     ` Benjamin Herrenschmidt
2007-05-28  9:37                       ` Liu Dave-r63238
2007-05-28 10:00                         ` Benjamin Herrenschmidt
2007-05-28 10:23                           ` Gabriel Paubert
2007-05-28 10:28                             ` Benjamin Herrenschmidt
2007-05-22  8:46         ` Gabriel Paubert
2007-05-22  9:14           ` Benjamin Herrenschmidt
2007-05-22 10:02             ` Gabriel Paubert
2007-05-22 10:05               ` Benjamin Herrenschmidt
2007-05-23  9:12                 ` Gabriel Paubert
2007-05-22  3:03 ` Kumar Gala

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