Bug 1491188 - ethtool tx_dropped counter incorrect
Summary: ethtool tx_dropped counter incorrect
Alias: None
Product: Fedora
Classification: Fedora
Component: ethtool
Version: 26
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Jaromír Cápík
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2017-09-13 09:20 UTC by Ross Ilott
Modified: 2018-05-29 11:27 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2018-05-29 11:27:37 UTC
Type: Bug

Attachments (Terms of Use)

Description Ross Ilott 2017-09-13 09:20:55 UTC
Description of problem:
since upgrading to fedora 26, the tx_dropped counter as reported by ethtool is extremely high (higher than pythons sys.maxint, which I noticed as our metric collector can't handle values higher than that.

ifconfig reports a value of 0 for dropped:

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet <IP>  netmask  broadcast <broadcast>
        ether <MAC>  txqueuelen 1000  (Ethernet)
        RX packets 9445  bytes 3157060 (3.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 9715  bytes 2886494 (2.7 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xef400000-ef420000  

Version-Release number of selected component (if applicable):
Fedora 26
Kernel 4.11.9-300.fc26.x86_64
ethtool 4.11-1 and 4.8
e1000e version 3.2.6-k, firmware 0.13-4

How reproducible:
Reset your interface counters, then check your tx_dropped counter

Steps to Reproduce:
1. ethtool -S eth0 | grep tx_dropped
2. ifdown eth0
2. modprobe -r e1000e
3. modprobe e1000e
4. ifup eth0
5. ethtool -S eth0 | grep tx_dropped

Actual results:

     tx_dropped: 18446621232006148224
     tx_dropped: 18446621232170529792

Expected results:
     tx_dropped: 18446621232006148224
     tx_dropped: 0

Additional info:
Not sure if it's ethtool or the e1000e driver that's at fault here, ifconfig seems to report the correct value which implies it's ethtool

Please feel free to smack me down if I'm interpreting any of this incorrectly!

Thanks in advance,

Comment 1 Ross Ilott 2017-09-15 10:57:41 UTC
It seems some other counters are also incorrect:

rx_over_errors: 18446744072336037492
tx_fifo_errors: 94360692725424
tx_heartbeat_errors: 18446744072658293152

Comment 2 Ross Ilott 2017-09-18 13:27:55 UTC
Upgrading my e1000e driver to has fixed the problem

Comment 3 Robert Scheck 2017-11-04 00:10:32 UTC
Is this driver update part of the Linux kernel as shipped with Fedora?

Comment 4 Fedora End Of Life 2018-05-03 08:55:52 UTC
This message is a reminder that Fedora 26 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 26. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '26'.

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Comment 5 Fedora End Of Life 2018-05-29 11:27:37 UTC
Fedora 26 changed to end-of-life (EOL) status on 2018-05-29. Fedora 26
is no longer maintained, which means that it will not receive any
further security or bug fix updates. As a result we are closing this bug.

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