My understanding is the DDIO completely replaces DCA on sandy bridge and
newer hardware (E5+ xeons). I expected this is why I don't see "DCA" listed
when I load ixgbe, as I would on my nehalem systems.
I see the following when loading ixgbe 3.18.7 on an E5-2670 system (kernel
3.4.41):
ixgbe 0000:04:00.1: (PCI Express:5.0GT/s:Width x8) 00:1b:21:5c:66:0d
ixgbe 0000:04:00.1: eth3: MAC: 2, PHY: 9, SFP+: 4, PBA No: E68793-002
ixgbe 0000:04:00.1: eth3: Enabled Features: RxQ: 32 TxQ: 32 FdirHash RSC
ixgbe 0000:04:00.1: eth3: Intel(R) 10 Gigabit Network Connection
If I take the same system, unload ixgbe, and load ixgbe 3.19.1, I see this
(emphasis mine):
ixgbe 0000:04:00.1: PCI Express bandwidth of 32GT/s available
ixgbe 0000:04:00.1: (Speed:5.0GT/s, Width: x8, Encoding Loss:20%)
ixgbe 0000:04:00.1: eth3: MAC: 2, PHY: 9, SFP+: 4, PBA No: E68793-002
ixgbe 0000:04:00.1: 00:1b:21:5c:66:0d
ixgbe 0000:04:00.1: eth3: Enabled Features: RxQ: 32 TxQ: 32 FdirHash *DCA*RSC
ixgbe 0000:04:00.1: eth3: Intel(R) 10 Gigabit Network Connection
Can anyone explain why I see "DCA" with 3.19.1 and not with 3.18.7. Also,
does it matter?
Thanks,
Scott Silverman | IT | Simplex Investments | 312-360-2444
230 S. LaSalle St., Suite 4-100, Chicago, IL 60604
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