linux-kernel - Re: [PATCH] x86, sparseirq: let nr_irqs equal to NR

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Date:	Tue, 28 Dec 2010 12:42:04 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	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>
Subject: Re: [PATCH] x86, sparseirq: let nr_irqs equal to NR_IRQS

On Mon, Dec 27, 2010 at 04:54:11PM -0800, Yinghai Lu wrote:
> 
> 
> For x86_64 system:
> when we have 128 cpus with 5 ioapics, will have nr_irqs = 3064
> 	120 + 8 * 128 + 120 * 16
> systems could take 20 pcie,  when intel 10g are used with
> sriov and ixgbevf, every vf will need 3 irqs, and one device
> have 64 vf. so will need 20 * 3 * 64 = 3840.
> some 6 ports Intel 10gb may need more.
> 
> Just remove that function for x86, and let nr_irqs to NR_IRQS
> because We already have radix-tree and bit_map for searching desc for irq.

Won't that make the arch_probe_nr_irqs be NR_IRQS_LEGACY?

I am looking at Linus's today tree, or is this patch based on some other tree?

> 
> Notes: long before same vresion cause one of Ingo's setup udev hang...
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  arch/x86/kernel/apic/io_apic.c |   22 ----------------------
>  1 file changed, 22 deletions(-)
> 
> Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
> +++ linux-2.6/arch/x86/kernel/apic/io_apic.c
> @@ -3637,28 +3637,6 @@ int get_nr_irqs_gsi(void)
>  	return nr_irqs_gsi;
>  }
>  
> -#ifdef CONFIG_SPARSE_IRQ
> -int __init arch_probe_nr_irqs(void)
> -{
> -	int nr;
> -
> -	if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
> -		nr_irqs = NR_VECTORS * nr_cpu_ids;
> -
> -	nr = nr_irqs_gsi + 8 * nr_cpu_ids;
> -#if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
> -	/*
> -	 * for MSI and HT dyn irq
> -	 */
> -	nr += nr_irqs_gsi * 16;
> -#endif
> -	if (nr < nr_irqs)
> -		nr_irqs = nr;
> -
> -	return NR_IRQS_LEGACY;
> -}
> -#endif
> -
>  static int __io_apic_set_pci_routing(struct device *dev, int irq,
>  				struct io_apic_irq_attr *irq_attr)
>  {
> --
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