[Bug 221919] ixl: TX queue hang when using TSO and having a high and mixed network load

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221919

Peter Eriksson <peter at ifm.liu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |peter at ifm.liu.se

--- Comment #2 from Peter Eriksson <peter at ifm.liu.se> ---
This is a really annoying bug that we've also seen. I do not think it's related
to iSCSI though (since we aren't using it). Disabling TSO seems to help (but
also severly reduces transmission speed - in our case it drops from around
10Gbps to 3Gbps without TSO).

I our servers are SMB (and NFS, but not much yet) servers. Dell PowerEdge
730xd.

> FreeBSD 11.1
> ixl2: fw 5.40.47690 api 1.5 nvm 5.40 etid 80002d35 oem 18.4608.16

ixl0: Link is up, 10 Gbps Full Duplex, FEC: None, Autoneg: False, Flow Control:
Full
ixl0: link state changed to UP
ixl2: Link is up, 10 Gbps Full Duplex, FEC: None, Autoneg: False, Flow Control:
Full
ixl2: link state changed to UP

ixl0: <Intel(R) Ethernet Connection XL710/X722 Driver, Version - 1.7.12-k> mem
0xc9000000-0xc9ffffff,0xca008000-0xca00ffff at device 0.0 numa-domain 1 on
pci15
ixl0: Using MSIX interrupts with 9 vectors
ixl0: fw 5.40.47690 api 1.5 nvm 5.40 etid 80002d35 oem 18.4608.16
ixl0: PF-ID[0]: VFs 64, MSIX 129, VF MSIX 5, QPs 768, I2C
ixl0: Allocating 8 queues for PF LAN VSI; 8 queues active
ixl0: Ethernet address: 3c:fd:fe:24:e7:e0
ixl0: PCI Express Bus: Speed 8.0GT/s Width x8
ixl0: Failed to initialize SR-IOV (error=2)
ixl0: netmap queues/slots: TX 8/1024, RX 8/1024

ixl2: <Intel(R) Ethernet Connection XL710/X722 Driver, Version - 1.7.12-k> mem
0xcc000000-0xccffffff,0xcd008000-0xcd00ffff at device 0.0 numa-domain 1 on
pci16
ixl2: Using MSIX interrupts with 9 vectors
ixl2: fw 5.40.47690 api 1.5 nvm 5.40 etid 80002d35 oem 18.4608.16
ixl2: PF-ID[0]: VFs 64, MSIX 129, VF MSIX 5, QPs 768, I2C
ixl2: Allocating 8 queues for PF LAN VSI; 8 queues active
ixl2: Ethernet address: 3c:fd:fe:24:d6:a0
ixl2: PCI Express Bus: Speed 8.0GT/s Width x8
ixl2: Failed to initialize SR-IOV (error=2)
ixl2: netmap queues/slots: TX 8/1024, RX 8/1024

ixl0: Link is up, 10 Gbps Full Duplex, FEC: None, Autoneg: False, Flow Control:
Full
ixl0: link state changed to UP
ixl2: Link is up, 10 Gbps Full Duplex, FEC: None, Autoneg: False, Flow Control:
Full
ixl2: link state changed to UP
ixl2: link state changed to DOWN
ixl0: link state changed to DOWN
ixl0: Link is up, 10 Gbps Full Duplex, FEC: None, Autoneg: False, Flow Control:
Full
ixl0: link state changed to UP
ixl2: Link is up, 10 Gbps Full Duplex, FEC: None, Autoneg: False, Flow Control:
Full
ixl2: link state changed to UP
ixl2: Malicious Driver Detection event 2 on TX queue 0, pf number 0
ixl2: MDD TX event is for this function!ixl2: Interface stopped DISTRIBUTING,
possible flapping
ixl2: Interface stopped DISTRIBUTING, possible flapping
ixl2: Interface stopped DISTRIBUTING, possible flapping
...repeat...
ixl2: WARNING: queue 0 appears to be hung!
ixl2: WARNING: Resetting!

I managed to login to the server after a while and disable TSO and then things
started working again.


Would using the Intel-provided (instead of the 11.1 one) driver and firmware
(from their web site) help with this issue?

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