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SubjectRe: igb regression (interface hang) with latest -git

* Rafael J. Wysocki <rjw@sisk.pl> wrote:

> On Wednesday 21 January 2009, Ingo Molnar wrote:
> >
> > * Ingo Molnar <mingo@elte.hu> wrote:
> >
> > > > One other piece of info (in addition to what Bruce requested) that
> > > > would be useful is after you've done ifconfig eht0 up, cat
> > > > /proc/interrupts | grep eth0 and send that output (I want to see your
> > > > MSI-X configuration).
> > >
> > > here it is:
> > >
> > > 79: 35 0 9836 7451 1197 1360 766 0 2196 995 770 0 2051 863 4714 1879 PCI-MSI-edge eth0-tx-0
> > > 80: 2335 0 2718 3651 5024 9850 533 0 1405 1095 0 0 4421 1229 0 2002 PCI-MSI-edge eth0-tx-1
> > > 81: 33 0 0 5478 1125 6585 4865 6306 0 0 0 714 3757 0 2662 1020 PCI-MSI-edge eth0-tx-2
> > > 82: 21 1428 3136 3783 4249 6833 0 0 4175 0 0 1465 1940 1780 6286 0 PCI-MSI-edge eth0-tx-3
> > > 83: 40 0 0 4788 0 1486 0 7185 3998 8637 1409 6785 0 0 0 10060 PCI-MSI-edge eth0-rx-0
> > > 84: 70 1441 2606 1342 0 1678 4301 1839 0 6507 6910 16470 0 1484 1004 0 PCI-MSI-edge eth0-rx-1
> > > 85: 40 1368 0 3560 5022 2040 5 1719 0 2037 956 40 0 17264 6456 2833 PCI-MSI-edge eth0-rx-2
> > > 86: 44 414 5 1164 30 4513 4595 1542 0 10033 1151 0 4961 4203 0 10703 PCI-MSI-edge eth0-rx-3
> > > 87: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 PCI-MSI-edge eth0
> >
> > btw., i turned off CONFIG_PCI_MSI and that worked around the interface
> > hang - the box has 40 minutes uptime now and still no hang. (it would hang
> > within 5 minutes previously)
> >
> > can test the revert of any of these commits:
> >
> > e42e4ba: igb: fix anoying type mismatch warning on rx/tx queue sizing
> > 8d25332: igb: Fix build warning when DCA is disabled.
> > 26bc19e: igb: re-order queues to support cleaner use of ivar on 82576
> > 0e014cb: igb: defeature tx head writeback
> > 678c610: drivers/net/igb: remove dead code (function 'igb_read_pci_cfg')
> > 908a7a1: net: Remove unused netdev arg from some NAPI interfaces.
> > ea943d4: igb: fixup AER with proper error handling
> > 5e8427e: igb: Correctly determine pci-e function number in virtual environment
> > b4557be: igb: update handling of RCTL for smaller buffer sizes
> > cb7b48f: igb/e1000e: Naming interrupt vectors
> > 40a914f: igb: Add support for pci-e Advanced Error Reporting
> > 527d47c: igb: link up/down messages must follow a specific format
> > 5b9ab2e: Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
> > 69d728b: igb: loopback bits not correctly cleared from RCTL register
> > 9b07f3d: igb: remove unneeded bit refrence when enabling jumbo frames
> > f5f4cf0: igb: do not use phy ops in ethtool test cleanup for non-copper parts
> > 0082982: netdev: add more functions to netdevice ops
> > 68fd991: igb: Fix tx/rx_ring_count parameters for igb on suspend/resume/ring resize
> > b2d5653: igb: simplify swap in clean_rx_irq if using packet split
> > 2e5c692: igb: convert to net_device_ops
> > 198d6ba: Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
> > 4cf1653: netdevice: safe convert to netdev_priv() #part-2
> > babcda7: drivers/net: Kill now superfluous ->last_rx stores.
> > 7c510e4: net: convert more to %pM
> >
> > i had a quick look at all of them but none seem to have a direct
> > connection to MSI-X interrupt generation.
> >
> > There's a couple of ones that could have side effects:
> >
> > Maybe this one:
> >
> > 26bc19e: igb: re-order queues to support cleaner use of ivar on 82576
> >
> > due to its sheer commit size and due to its impact on the hw programming.
> >
> > or:
> >
> > 0e014cb: igb: defeature tx head writeback
> >
> > Might have some side-effect on tx-completion IRQs and might tickle
> > firmware bugs?
> >
> > Or:
> >
> > 5e8427e: igb: Correctly determine pci-e function number in virtual environment
> >
> > while it should have no impact on a native kernel, it does change the PCI
> > config space access sequences.
> >
> > Or maybe:
> >
> > 69d728b: igb: loopback bits not correctly cleared from RCTL register
> >
> > as this impacts the PCI programming too.
> >
> > But ... i dont really know this code so i'm guessing around.
>
> Well, AER (Advanced Error Reporting) is currently broken w/ MSI-X, so maybe
> this one:
>
> 40a914f: igb: Add support for pci-e Advanced Error Reporting

ah, yeah, that makes sense. I discarded that commit because i was unsure
whether this box has AER and the boot log said:

calling aer_service_init+0x0/0x20 @ 1
initcall aer_service_init+0x0/0x20 returned 0 after 61 usecs

shouldnt it have printed something if AER was available?

Ingo


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