Hi, Thanks for looking into it. It has been a while, and I have rebooted the server since, so I will not be able to do anymore post mortem analysis. (BTW I've also upgraded to the latest ixgbe driver, and it solved the ifconfig TX counter issue.)
I have flow control explicitly disabled on the switch, and the card seemed to receive the packets (dropped counter increased by the same rate as the switch sent the packets). It looks like the card/driver thought it had run out of buffers, and that's what made it drop the packets. Matyas On Thu, 26 Feb 2015, Tantilov, Emil S wrote: > >-----Original Message----- > >From: Matyas Koszik [mailto:kos...@atw.hu] > >Sent: Thursday, January 08, 2015 2:59 AM > >Subject: Re: [E1000-devel] ixgbe: All RX packets go to rx_missed_errors > > > >Hi, > > > >There're no logs at all related to the event (only the applications > >complained about the loss of connectivity). OS is centos 6.6, HW is > >supermicro X8DAH with 2xE5645. > > > >I've attached the output of (ifconfig eth5;ethtool -S eth5;sleep > >10;ifconfig eth5;ethtool -S eth5). > > From your attachment: > > before > > rx_missed_errors: 659311 > > tx_flow_control_xon: 3 > rx_flow_control_xon: 0 > tx_flow_control_xoff: 42291616 > rx_flow_control_xoff: 0 > > after > > rx_missed_errors: 659384 > > tx_flow_control_xon: 3 > rx_flow_control_xon: 0 > tx_flow_control_xoff: 42297579 > rx_flow_control_xoff: 0 > > Note that only rx_missed_errors and tx_flow_controll_xoff are incrementing. > The rx_missed_errors counter comes from the MPC register which is usually an > indication of insufficient buffers on Rx or bus bandwidth. Also note that in > the 10 seconds the tx_flow_control_xon is the only counter not incrementing > which makes it look like your interface is transmitting XOFF frames nonstop > (at least in that time span). That may explain why you are not receiving, > although I'm not sure how your vlans work (provided they are on the same > interface) and also the XOFF may not matter in this case if you switch does > not have flow control enabled. Still it is probably a good idea to disable > flow control on the interface and get the stats again to see what other > counters will increment. > > Thanks, > Emil > > > ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ 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
