Hi e1000e list,
Hi Bruce as e1000e 1588 author,
I'm trying to use an 82579LM (connected to a QM77 chipset laptop) for
802.1AS/1588v2 time sync. I'm seeing excessive pdelays:
1000mbit FD - 7300ns
100mbit FD - 23000ns
10mbit FD - 90000ns
The delay being speed dependent already is a bug to start out with, it
should only depend on cable length really. The default cutoff for
bringing up time sync is 3800ns, so it doesn't even come up. If I
manually raise that bar, I do get a stable sync - by tens of nanoseconds
in fact, so hardware timestamping is correctly working. There just
seems to be an offset somewhere...
Also, interestingly the switch side always says 7300ns, no matter the
speed. So it's direction dependent?
Peer system is an Extreme Networks X440 switch, and I'm using
linuxptp-1.2 on the laptop. The software works fine on a TI BeagleBone
(ARM/AM3359) with the same switch (850~1100ns delay @ 100mbit).
Chip:
00:19.0 Ethernet controller [0200]: Intel Corporation 82579LM Gigabit Network
Connection [8086:1502] (rev 04)
Subsystem: Hewlett-Packard Company Device [103c:179b]
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 48
Region 0: Memory at d4400000 (32-bit, non-prefetchable) [size=128K]
Region 1: Memory at d443a000 (32-bit, non-prefetchable) [size=4K]
Region 2: I/O ports at 5020 [size=32]
Capabilities: [c8] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Address: 00000000fee00418 Data: 0000
Capabilities: [e0] PCI Advanced Features
AFCap: TP+ FLR+
AFCtrl: FLR-
AFStatus: TP-
Kernel driver in use: e1000e
$ ethtool -i eth0
driver: e1000e
version: 2.2.14-k
firmware-version: 0.15-4
Kernel is 3.9.4, I didn't see relevant changes after that, hope I didn't
miss anything.
Laptop is a HP EliteBook 8470p. It has a MEI/AMT, in case *that* screws
up the timing.
So, uh... how do I go about debugging this? I don't really have any
idea to start out with. Source could be anything from HW to MEI to BIOS
interference to driver bug to API misuse...
Cheers,
-David
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