netdev - Re: tg3 bad performance, lots of hardware interrupts

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Date:	Fri, 28 Mar 2008 20:09:17 +0200 (EET)
From:	Harald Hannelius <harald@....fi>
To:	Michael Chan <mchan@...adcom.com>
cc:	Jiri Kosina <jkosina@...e.cz>, David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: tg3 bad performance, lots of hardware interrupts


On Fri, 28 Mar 2008, Michael Chan wrote:

> On Fri, 2008-03-28 at 19:37 +0200, Harald Hannelius wrote:
>> # cat /proc/interrupts
>>             CPU0       CPU1
>>    0:        111          1   IO-APIC-edge      timer
>>    1:          0          2   IO-APIC-edge      i8042
>>    2:          0          0    XT-PIC-XT        cascade
>>    5:          0          0   IO-APIC-fasteoi   sata_nv
>>    7:        856         51   IO-APIC-fasteoi   ohci_hcd:usb2
>>   10:          0          3   IO-APIC-fasteoi   sata_nv, ehci_hcd:usb1
>>   11:       4305          7   IO-APIC-fasteoi   sata_nv
>>   12:          0          4   IO-APIC-edge      i8042
>> 216:       4217     128932   PCI-MSI-edge      eth2
>> 217:     161107     685351   PCI-MSI-edge      eth0
>> NMI:          0          0   Non-maskable interrupts
>> LOC:    2380762    2619917   Local timer interrupts
>> RES:       3000       3269   Rescheduling interrupts
>> CAL:         16         31   function call interrupts
>> TLB:         64        111   TLB shootdowns
>> TRM:          0          0   Thermal event interrupts
>> SPU:          0          0   Spurious interrupts
>> ERR:          1
>> MIS:          0
>>
>> Well, shared or not, yes and no. I think that /proc/interrupts
>> contains
>> soft-interrupts. The problem child is interface eth2.
>>
>> As rapported by ifconfig the interface is on IRQ 5:
>
> eth2 is using MSI.  When using MSI, the IRQ reported by ifconfig is not
> accurate.  You said you have tried booting with nomsi, but have you
> confirmed that by checking /proc/interrupts?

I did, at least the interface wasn't on MSI-edge anymore. I cannot 
remember what IRQ the NIC took when booted with pci=nomsi (something like 
that), it could have been 10 or other IRQ below 20, if I recall correctly.


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