>-----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
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