Red Hat Bugzilla – Bug 1379431
PCP network.interface.speed values are inaccurate
Last modified: 2016-12-01 19:17:46 EST
Description of problem: The expected values of network.interface.speed for the gigabit ethernet on a laptop (Lenovo thinkpad W530) look way off from the expected values. Not having reasonable values for this metric makes it very difficult to determine the network interface utilization. Version-Release number of selected component (if applicable): $ rpm -q pcp pcp-3.11.4-1.fc24.x86_64 $ uname -a Linux santana 4.7.4-200.fc24.x86_64 #1 SMP Thu Sep 15 18:42:09 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux How reproducible: Every time Steps to Reproduce: 1. Install pcp on fedora 24 2. pmval network.interface.speed Actual results: $ pminfo -d network.interface.speed network.interface.speed Data Type: float InDom: 60.3 0xf000003 Semantics: discrete Units: Mbyte / sec $ pmval network.interface.speed metric: network.interface.speed host: santana semantics: discrete instantaneous value units: Mbyte / sec samples: all wlp3s0 lo virbr0-nic virbr0 vnet0 em1 docker0 2.146 ? 7.813E+04 ? 7.813E+04 7.813E+06 ? 2.146 ? 7.813E+04 ? 7.813E+04 7.813E+06 ? Expected results: Would expect the results to be more like the rhel7 on a W541 machine like the following (enp0s25 interface): $ rpm -q pcp pcp-3.10.6-2.el7.x86_64 [wcohen@dhcp129-2 ~]$ uname -a Linux dhcp129-2.rdu.redhat.com 3.10.0-482.el7.x86_64 #1 SMP Mon Aug 1 10:31:16 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux $ pmval network.interface.speed metric: network.interface.speed host: dhcp129-2.rdu.redhat.com semantics: discrete instantaneous value units: Mbyte / sec samples: all enp0s25 lo virbr0-nic virbr0 119.2 ? 1.192 ?
This issue was introduced between the 3.10.6 and the 3.11. On a RHEL7 machine build the PCP 3.11 RPMs and install them. Got the same incorrect results on RHEL7 using the newer PCP 3.11. Comparing the values of broken/working it looks like PCP 3.11 has the values about 65K (~2^16) higher than the correct values. When I reverted following patch in PCP the network.interface.speed values look more reasonable: commit 9b616ace2284b622c4a8e7eae7766c11a2f0b9e8 Author: Nathan Scott <nathans@redhat.com> Date: Tue Sep 22 17:32:52 2015 +1000 pmdalinux: correctly report high speed network link speeds The kernel ethtool ioctl interface was extended to allow speeds beyond 1Gbps to be reported - update to use this (back-compat) extension. We only use this interface nowadays if the sysfs access to read interface speed fails.
Created attachment 1216645 [details] typo fix
Fixed by upstream commit f1915a72d42be118f60aaf2018a0d5c22cee11a4
pcp-3.11.6-1.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-d0ad9e5194
pcp-3.11.6-1.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2016-15f10c1698
pcp-3.11.6-1.fc25 has been submitted as an update to Fedora 25. https://bodhi.fedoraproject.org/updates/FEDORA-2016-a7626fa3f1
pcp-3.11.6-1.el5 has been submitted as an update to Fedora EPEL 5. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-a7454a07e7
pcp-3.11.6-1.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-a7626fa3f1
pcp-3.11.6-1.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-15f10c1698
pcp-3.11.6-1.fc24 has been pushed to the Fedora 24 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-d0ad9e5194
pcp-3.11.6-1.el5 has been pushed to the Fedora EPEL 5 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-a7454a07e7
pcp-3.11.6-1.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.
pcp-3.11.6-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
pcp-3.11.6-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
pcp-3.11.6-1.el5 has been pushed to the Fedora EPEL 5 stable repository. If problems still persist, please make note of it in this bug report.