On 2023-04-19 09:32, Andrei Borzenkov wrote:
On Wed, Apr 19, 2023 at 10:16 AM Per Jessen <per@opensuse.org> wrote:
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 4c:cc:6a:61:50:a1 brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped missed mcast 23406734220 16321239 0 5700 9849 79742
First impression - that's a _lot_ dropped and missed.
Told you.
You did? when your machine is dropping packets, either there is a problem with that machine or your network is overloaded.
"dropped" also includes packets with the wrong MAC address so it could be due to e.g. switch packet flooding (or maybe the switch is actually a hub in disguise). In any case, it counts good packets (without error) received by interface but ignored. So it does not necessarily indicate host, rather overall network configuration issues.
I have no idea what "missed" means.
--><-- Counts number of packets dropped by the device due to lack of buffer space. This usually indicates that the host interface is slower than the network interface, or host is not keeping up with the receive packet rate. --><--
...
Well, if it were me, I would investigate - those numbers seem way too high.
That's about 0.1% of all received packets and we do not know for which period. Are those numbers increasing?
Isengard, now: 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 4c:cc:6a:61:50:a1 brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped missed mcast 23485290655 17088751 0 6494 9849 90980 TX: bytes packets errors dropped carrier collsns 781557805 5297212 0 0 0 0 altname enp3s0 Yesterday: Isengard: 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 4c:cc:6a:61:50:a1 brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped missed mcast 23406734220 16321239 0 5700 9849 79742 TX: bytes packets errors dropped carrier collsns 693306794 4560203 0 0 0 0 altname enp3s0 Telcontar, now: 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 00:d8:61:a1:5a:bd brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped missed mcast 1752303369 5230439 0 3190 0 82323 TX: bytes packets errors dropped carrier collsns 23227299542 16277311 0 0 0 0 altname enp34s0 Yesterday: 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 00:d8:61:a1:5a:bd brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped missed mcast 1713292131 5141166 0 2838 0 73508 -- Cheers / Saludos, Carlos E. R. (from 15.4 x86_64 at Telcontar)