Date: Mon, 18 May 2015 13:01:42 +0000 From: "Eggert, Lars" <lars@netapp.com> To: =?utf-8?B?Um9nZXIgUGF1IE1vbm7DqQ==?= <roger.pau@citrix.com> Cc: "freebsd-xen@freebsd.org" <freebsd-xen@freebsd.org> Subject: Re: Xen dom0 "interrupt storm detected on "irq16:"; throttling interrupt source" Message-ID: <FB868DEF-5062-4C49-9980-74A1906994A7@netapp.com> In-Reply-To: <55561EBC.8080901@citrix.com> References: <EAB58E00-BA0A-45FB-A709-01359219C106@netapp.com> <55531131.7040404@citrix.com> <65D7289A-9261-4F02-88E5-B2D137C268C1@netapp.com> <5553651D.3000400@citrix.com> <FFAA0565-3513-4097-A356-8BED9DB61307@netapp.com> <5555DFBC.9030306@citrix.com> <683335F9-E04E-4F8C-B1EF-0047E63E00AD@netapp.com> <5555FF4A.8010702@citrix.com> <126FDC37-2822-45DB-9AA6-3C9A03D89959@netapp.com> <55560414.1040002@citrix.com> <91758942-3683-42E5-9B39-66775E48D4DF@netapp.com> <55561EBC.8080901@citrix.com>
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[-- Attachment #1 --]
Unfortunately, the storm is still there with this patch.
On 2015-5-15, at 18:28, Roger Pau Monné <roger.pau@citrix.com> wrote:
>
> El 15/05/15 a les 16.42, Eggert, Lars ha escrit:
>> On 2015-5-15, at 16:35, Roger Pau Monné <roger.pau@citrix.com> wrote:
>>>
>>> Yes, but I've realized that isci for example passes an uint32_t instead
>>> of an int, so it might be best to set it to 0.
>>
>> Here is what I see now:
>>
>> isci0: <Intel(R) C600 Series Chipset SAS Controller (SATA mode)> port 0x6000-0x60ff mem 0xde07c000-0xde07ffff,0xddc00000-0xddffffff irq 16 at device 0.0 on pci10
>> isci0: attempting to allocate 2 MSI-X vectors (2 supported)
>> ISCI: isci->num_interrupts: 2 max_msix_messages: 2
>> isci: 1:000089 ISCI bus_alloc_resource failed
>>
>> The storm is still there.
>
> Yes, after looking at the code, isci really needs to check for the
> return value of pci_alloc_msix, because num_interrupts is not updated
> if the allocation fails. Following patch should hopefully fix it,
> please give it a try.
>
> Roger.
> ---
> diff --git a/sys/dev/isci/isci_interrupt.c b/sys/dev/isci/isci_interrupt.c
> index 52c64f7..f331f3c 100644
> --- a/sys/dev/isci/isci_interrupt.c
> +++ b/sys/dev/isci/isci_interrupt.c
> @@ -128,6 +128,7 @@ isci_interrupt_setup(struct isci_softc *isci)
> isci->controller_count;
> BOOL use_msix = FALSE;
> uint32_t force_legacy_interrupts = 0;
> + int rc;
>
> TUNABLE_INT_FETCH("hw.isci.force_legacy_interrupts",
> &force_legacy_interrupts);
> @@ -136,8 +137,8 @@ isci_interrupt_setup(struct isci_softc *isci)
> pci_msix_count(isci->device) >= max_msix_messages) {
>
> isci->num_interrupts = max_msix_messages;
> - pci_alloc_msix(isci->device, &isci->num_interrupts);
> - if (isci->num_interrupts == max_msix_messages)
> + rc = pci_alloc_msix(isci->device, &isci->num_interrupts);
> + if (rc == 0 && isci->num_interrupts == max_msix_messages)
> use_msix = TRUE;
> }
>
>
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