I didn't found any detailed information what "mdf" errors mean, it doesn't seem to affect traffic, at least ICMP.
It looks like something in driver.
For me the error counter is growing around 120 hits per minute, with almost zero traffic on interface.
I found it, when I had issues with application on phone disconnecting from server running on raspberry.
Code: Select all
[email protected]:~# ethtool -S eth0 | grep err rx_errors: 0 tx_errors: 0 rx_mtu_err: 0 tx_fcs_err: 0 rbuf_err_cnt: 0 mdf_err_cnt: 897049 rxq0_errors: 0 rxq1_errors: 0 rxq2_errors: 0 rxq3_errors: 0 rxq16_errors: 0 [email protected]:~# uname -a Linux rpi4 4.19.67-v7l+ #1254 SMP Fri Aug 23 15:17:21 BST 2019 armv7l GNU/Linux