lkml.org 
[lkml]   [2010]   [Dec]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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@kernel.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)
> {
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/


\
 
 \ /
  Last update: 2010-12-28 18:45    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site