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

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Message-ID: <4910AD4B.5070807@zytor.com>
Date:	Tue, 04 Nov 2008 12:15:07 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	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>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Mike Travis <travis@....com>
Subject: Re: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes

Jeremy Fitzhardinge wrote:
> Ingo Molnar wrote:
>> ( another advantage is that the 6 bytes GDT descriptor is more  
>> compressed and hence uses up less L1/L2 cache footprint than the  
>> larger (~7 byte) trampolines we have at the moment. )
>>   
> 
> Also its D cache rather than I cache, which is generally more
> plentiful.  However, I think the cost of GDT cache misses on exception
> latency is something that we've largely overlooked, and this will make
> it a bigger factor (vs cache misses on the actual exception handler code
> itself, which should be reduced).
> 

Besides, a GDT entry is 8 bytes, not 6.

	-hpa
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