> -----Original Message----- > From: Ben Greear [mailto:[email protected]] > Sent: Tuesday, December 04, 2012 5:35 PM > To: Skidmore, Donald C > Cc: e1000-devel list > Subject: Re: [E1000-devel] Question on ixgbe and bus speed/width. > > On 12/04/2012 05:27 PM, Skidmore, Donald C wrote: > >> -----Original Message----- > >> From: Ben Greear [mailto:[email protected]] > >> Sent: Tuesday, December 04, 2012 5:19 PM > >> To: e1000-devel list > >> Subject: [E1000-devel] Question on ixgbe and bus speed/width. > >> > >> I'm testing a 4 port 10G NIC (ixgbe) in a pci-e gen3 motherboard. > >> > >> On most boots, all 4 ports show 5GT/s x8 bus, but on at least one > >> boot, two of the NICs came up as 5GT/s and x4. It took a long time > >> to notice this was the problem that caused poor performance. > >> > >> Is there a way in ethtool, or another standard-ish way to query the > >> bus speed and width? > >> > >> > >> Thanks, > >> Ben > > > > Looking for something like 'lspci -vv'? > > That shows some 'Capabilities' mentioning 5GT/s, but is that just what the > NIC is theoretically capable of, or it's current negotiated speed? >
My understanding was it displayed it's current negotiated speed and lanes used. For what it is worth the ixgbe driver should log a warning during probe if we don't get the PCIe link we need for full speed. Although it is more complex with the 4 port as there the switch on the NIC in the way. Thanks, -Don ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
