From: Andi Kleen <ak@muc.de>
To: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Cc: Ashok Raj <ashok.raj@intel.com>, Andrew Morton <akpm@osdl.org>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch 13/14] x86_64: Use common functions in cluster and physflat mode
Date: 13 Sep 2005 17:31:06 +0200
Date: Tue, 13 Sep 2005 17:31:06 +0200 [thread overview]
Message-ID: <20050913153106.GB14316@muc.de> (raw)
In-Reply-To: <Pine.LNX.4.61.0509130749210.1684@montezuma.fsmlabs.com>
On Tue, Sep 13, 2005 at 07:53:03AM -0700, Zwane Mwaikambo wrote:
> On Tue, 13 Sep 2005, Andi Kleen wrote:
>
> > > We should probably remove the !HOTPLUG case and just use the mask version
> > > for all cases <=8 CPUS, use physflat or the cluster mode for >8cpus as
> > > the case may be, instead of defaulting to sequence_IPI which seems
> > > a little overkill for the intended purpose.
> >
> > Or just always use physflat and remove the logical flat case?
> > That seems cleanest to me. Any objections?
>
> My objection is the number of APIC writes required to issue IPIs to a
> group of processors, however i do understand that it would help
local APIC accesses are cheap, they don't go over any external bus.
It's not like a PCI cycle.
> maintainability and testing coverage if we reduce the number of operating
> modes, are you proposing physflat for _everything_ ?
On everything that's currently run by flat yes. Possibly the others
too when tested.
-Andi
next prev parent reply other threads:[~2005-09-13 15:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200509032135.j83LZ8gX020554@shell0.pdx.osdl.net>
[not found] ` <20050905231628.GA16476@muc.de>
2005-09-06 23:12 ` [patch 13/14] x86_64: Use common functions in cluster and physflat mode Ashok Raj
2005-09-09 17:07 ` Zwane Mwaikambo
2005-09-09 20:45 ` Ashok Raj
2005-09-11 16:44 ` Zwane Mwaikambo
2005-09-11 23:02 ` Andi Kleen
2005-09-12 22:23 ` Ashok Raj
2005-09-13 8:10 ` Andi Kleen
2005-09-13 14:53 ` Zwane Mwaikambo
2005-09-13 15:31 ` Andi Kleen [this message]
2005-09-10 0:30 ` Andi Kleen
2005-09-10 1:51 ` Zwane Mwaikambo
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