Re: tg3 bad performance, lots of hardware interrupts

[Harald Hannelius]

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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