linux-kernel - Re: [PATCH 2/2] x86: implement multiple queues for smp function call IPIs

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Date:	Thu, 31 Jul 2008 21:58:50 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] x86: implement multiple queues for smp function	call
 IPIs

Ingo Molnar wrote:
> Yes on the 64-bit side we've had NUM_INVALIDATE_TLB_VECTORS (==8) for a 
> long time, but note that 64-bit is obviously for more modern CPUs. What 
> i'm mindful about (i'm not _that_ worried) are fragile APICs and unknown 
> erratas.
>   

Well, the whole exercise is only useful if you have a relatively large 
number of CPUs, which presumably means you have relatively modern 
APICs.  If we set the number of queues to 1 for < 4 CPUs, would that 
avoid the problem APICs?

    J
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