The driver is just telling you what's possible not that DCA is enabled. The newer chipsets do not included it as it's all DDIO. So even though the NIC's is capable of support DCA the chipset does not have it so it won't be used. That's all this is saying. It's not an issue at all.
Cheers, John > -----Original Message----- > From: Scott Silverman [mailto:ssilver...@simplexinvestments.com] > Sent: Monday, February 10, 2014 11:59 AM > To: e1000-devel@lists.sourceforge.net > Subject: [E1000-devel] DCA on Sandy Bridge? > > 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 ------------------------------------------------------------------------------ Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151&iu=/4140/ostg.clktrk _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
