Le 24/05/2013 18:07, Ben Hutchings a écrit :
>> With Linux 3.8, my computer starts (after some time) flooding its
>> network interface with pause packets, effectively freezing it and
>> other network-dependent computers connected to the same switch.
>
> Switches should normally be configured to generate but not respond
> to pause frames. I don't know how unmanaged switches are typically
> configured. What do ethtool (no options and 'ethtool -a' report for
> this device?
The other frozen computers are connected via an unmanaged switch.
# ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 2
Transceiver: internal
Auto-negotiation: on
MDI-X: off
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000001 (1)
drv
Link detected: yes
# ethtool -a eth0
Pause parameters for eth0:
Autonegotiate: on
RX: on
TX: on
>> When I connect directly my laptop to the computer, and run tcpdump on
>> the laptop, I see:
>> [...]
> There seems to be a bug in your laptop's network driver, because pause
> frames should not be passed to the kernel. (Usually they are
> discarded by the MAC.)
Even in promiscuous mode?
> [...]
>> 00:19.0 Ethernet controller [0200]: Intel Corporation 82579LM Gigabit
>> Network Connection [8086:1502] (rev 04)
>> Subsystem: Hewlett-Packard Company Device [103c:1494]
>> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
>> Stepping- SERR+ FastB2B- DisINTx+
>> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
>> <MAbort- >SERR- <PERR- INTx-
>> Latency: 0
>> Interrupt: pin A routed to IRQ 46
>> Region 0: Memory at fe400000 (32-bit, non-prefetchable) [size=128K]
>> Region 1: Memory at fe428000 (32-bit, non-prefetchable) [size=4K]
>> Region 2: I/O ports at f080 [size=32]
>> Capabilities: <access denied>
>> Kernel driver in use: e1000e
> [...]
>
> I assume this is the device that's spewing pause frames?
You assume right.
Cheers,
--
Stéphane
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