linux-kernel - Re: Subject: [PATCH 1/2] x86: get back 15 vectors

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Message-ID: <4B42362F.7040302@kernel.org>
Date:	Mon, 04 Jan 2010 10:40:47 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Jesse Brandeburg <jesse.brandeburg@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	NetDEV list <netdev@...r.kernel.org>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: Subject: [PATCH 1/2] x86: get back 15 vectors

On 01/04/2010 08:18 AM, Eric W. Biederman wrote:
> Yinghai Lu <yinghai@...nel.org> writes:
> 
> This patch is wrong.
> 
>> between FIRST_EXTERNAL_VECTOR (0x20) and FIRST_DEVICE_VECTOR (0x41)
>>
>> for 0x20 and 0x2f, we are safe be used_vectors will prevent it to use used one.
> 
> We can not use any of 0x20 - 0x2f for ioapic irqs.  We need the entire
> priority level to ensure that the irq move cleanup ipi is of a lower
> priority.
> 
>> also try to reuse 0x30 to 0x3f after smp_affinity for irq[0,15] is changed to other cpu.
> 
> There may be a point with 0x30 to 0x3f as I recall when those irqs come through a legacy
> pic we need to reserve those vectors on all cpus.

ok, I see.

any reason that we can not use 0x40?

Thanks

Yinghai
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