I just read the following in a recent patch for ixgbe:
"MSI-X allocation broke after the 82599 merge on systems with more than
8 CPU cores. 82598 drops back into MSI mode, which isn't sufficient to
run full, efficient 10G line rate."
I have a Supermicro X7DWE 5400 (Seaburg) based motherboard, with a
couple of 82598EB 10 Gigabit AF cards installed in x8 MCH connected slots.
The system is running 2.6.27.19-78.2.30.fc9.x86_64 and ixgbe 1.3.18-k4.
lspci -vv
04:00.0 Ethernet controller: Intel Corporation 82598EB 10 Gigabit AF
Dual Port Network Connection (rev 01)
Subsystem: Intel Corporation 10 Gigabit XF SR Dual Port Server
Adapter
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, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 54
Region 0: Memory at de280000 (32-bit, non-prefetchable) [size=128K]
Region 1: Memory at de200000 (32-bit, non-prefetchable) [size=256K]
Region 2: I/O ports at 3000 [size=32]
Region 3: Memory at de2c0000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: ixgbe
Kernel modules: ixgbe
/proc/interrupts shows:
2287: 13 18 28 49 PCI-MSI-edge
eth0:lsc
2288: 9141 136551 21455 238464 PCI-MSI-edge
eth0:v7-Tx
2289: 48562 109176 24880 135639 PCI-MSI-edge
eth0:v6-Tx
2290: 107570 3702139 75813 3727686 PCI-MSI-edge
eth0:v5-Tx
2291: 89445 9720752 132501 4888981 PCI-MSI-edge
eth0:v4-Tx
2292: 137766 210305 24363 145395 PCI-MSI-edge
eth0:v3-Rx
2293: 67075 7653882 70646 15840483 PCI-MSI-edge
eth0:v2-Rx
2294: 89234 4985296 78648 6575514 PCI-MSI-edge
eth0:v1-Rx
2295: 114302 232087 56105 256490 PCI-MSI-edge
eth0:v0-Rx
Does this mean the card is using MSI or MSI-X interrupts?
If MSI, in light of the quote above, how do I enable MSI-X?
Regards,
Richard
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