Bug 1819058
Summary: | virsh capabilities can't display the real-time number for hugepages | ||
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Product: | Red Hat Enterprise Linux Advanced Virtualization | Reporter: | Jing Qi <jinqi> |
Component: | libvirt | Assignee: | Michal Privoznik <mprivozn> |
Status: | CLOSED ERRATA | QA Contact: | Jing Qi <jinqi> |
Severity: | low | Docs Contact: | |
Priority: | low | ||
Version: | 8.2 | CC: | drjones, jdenemar, jen, jsuchane, lmen, mprivozn, virt-maint, xuzhang, yalzhang, yanqzhan |
Target Milestone: | rc | Keywords: | Regression, Triaged |
Target Release: | 8.2 | ||
Hardware: | x86_64 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | libvirt-7.0.0-1.el8 | Doc Type: | If docs needed, set a value |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2021-05-25 06:42:08 UTC | Type: | Bug |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | 7.0.0 |
Embargoed: | |||
Bug Depends On: | |||
Bug Blocks: | 1897025 |
Description
Jing Qi
2020-03-31 06:25:49 UTC
I think this is the regression caused by us caching host side capabilities (e.g. NUMA) since v6.0.0-rc1~439 and friends. Let me see if I can fix it. Patch proposed upstream: https://www.redhat.com/archives/libvir-list/2020-December/msg00023.html Merged upstream: 40a162f83e qemu: Don't cache NUMA caps v6.10.0-114-g40a162f83e Verified with libvirt upstream version : v6.10.0-206-gbff2ad5d6b S1: steps: 1. Check the number of pages of size='2048'. # virsh capbilities Part of output is as following- <topology> <cells num='1'> <cell id='0'> <memory unit='KiB'>3832548</memory> <pages unit='KiB' size='4'>958137</pages> <pages unit='KiB' size='2048'>0</pages> <pages unit='KiB' size='1048576'>0</pages> <distances> <sibling id='0' value='10'/> </distances> <cpus num='2'> <cpu id='0' socket_id='0' die_id='0' core_id='0' siblings='0'/> <cpu id='1' socket_id='1' die_id='0' core_id='0' siblings='1'/> </cpus> </cell> </cells> </topology> 2. echo 200 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages 3. Check the number of pages of size='2048' again. # virsh capbilities The number of pages of size='2048' changed to "200". <topology> <cells num='1'> <cell id='0'> <memory unit='KiB'>3832548</memory> <pages unit='KiB' size='4'>855737</pages> <pages unit='KiB' size='2048'>200</pages> <pages unit='KiB' size='1048576'>0</pages> <distances> <sibling id='0' value='10'/> </distances> <cpus num='2'> <cpu id='0' socket_id='0' die_id='0' core_id='0' siblings='0'/> <cpu id='1' socket_id='1' die_id='0' core_id='0' siblings='1'/> </cpus> </cell> </cells> </topology> 4. # virsh freepages --all Node 0: 4KiB: 51359 2048KiB: 200 1048576KiB: 0 Verified with version: libvirt-daemon-7.0.0-1.module+el8.4.0+9464+3e71831a.x86_64 qemu-kvm-5.2.0-2.module+el8.4.0+9186+ec44380f.x86_64 S1. Check the pages number in the output of "virsh capabilities" can be changed at once steps: 1. Check the number of pages of size='2048'. # virsh capbilities Part of output is as following- <topology> <cells num='1'> <cell id='0'> <memory unit='KiB'>3832548</memory> <pages unit='KiB' size='4'>958137</pages> <pages unit='KiB' size='2048'>0</pages> <pages unit='KiB' size='1048576'>0</pages> <distances> <sibling id='0' value='10'/> </distances> <cpus num='2'> <cpu id='0' socket_id='0' die_id='0' core_id='0' siblings='0'/> <cpu id='1' socket_id='1' die_id='0' core_id='0' siblings='1'/> </cpus> </cell> </cells> </topology> 2. echo 200 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages 3. Check the number of pages of size='2048' again. # virsh capbilities The number of pages of size='2048' changed to "200". <topology> <cells num='1'> <cell id='0'> <memory unit='KiB'>3832548</memory> <pages unit='KiB' size='4'>855737</pages> <pages unit='KiB' size='2048'>200</pages> <pages unit='KiB' size='1048576'>0</pages> <distances> <sibling id='0' value='10'/> </distances> <cpus num='2'> <cpu id='0' socket_id='0' die_id='0' core_id='0' siblings='0'/> <cpu id='1' socket_id='1' die_id='0' core_id='0' siblings='1'/> </cpus> </cell> </cells> </topology> 4. # virsh freepages --all Node 0: 4KiB: 51359 2048KiB: 200 1048576KiB: 0 Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (virt:av bug fix and enhancement update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:2098 |