linux-kernel - Re: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes

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Message-ID: <20081105175318.GD7286@localhost>
Date:	Wed, 5 Nov 2008 20:53:18 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Andi Kleen <andi@...stfloor.org>,
	Alexander van Heukelum <heukelum@...lshack.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, lguest@...abs.org,
	jeremy@...source.com, Steven Rostedt <srostedt@...hat.com>,
	Mike Travis <travis@....com>
Subject: Re: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes

[Ingo Molnar - Tue, Nov 04, 2008 at 10:52:45PM +0100]
| 
| * H. Peter Anvin <hpa@...or.com> wrote:
| 
| > Ingo Molnar wrote:
| > > * Ingo Molnar <mingo@...e.hu> wrote:
| > > 
| > >> And as hpa's comments point it out, compressing the rather stupid 
| > >> irq stubs might be a third option that looks promising as well.
| > > 
| > > ... and we should try and see how far we can compress those stubs, 
| > > before we do any segment register based tricks.
| > > 
| > 
| > Using the techniques previously mentioned, for 224 vectors:
| > 
| > 1792 bytes ( 8 bytes/stub) - trivial.
| > 1568 bytes ( 7 bytes/stub) - same without alignment.
| >  952 bytes (~4 bytes/stub) - extra jump needed.
| > 
| > For comparison, the IDT itself is 2048 bytes on x86-32 and 4096 bytes on
| > x86-64.
| 
| sounds like a plan :)
| 
| 	Ingo
| 

Ingo, what the conclusion is? As I understand from the thread --

1) Implement Peter's proposed cleanup/compress.
2) Test Alexander's patche.

Did I miss something?

		- Cyrill -
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