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

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Message-ID: <20081104215245.GC17775@elte.hu>
Date:	Tue, 4 Nov 2008 22:52:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Alexander van Heukelum <heukelum@...tmail.fm>,
	Andi Kleen <andi@...stfloor.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	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


* 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
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