I set the Kernel parameters, put the host in maintenance, rebooted it, then did a "reinstall host", but its still showing any available in the host general info.
[image: image.png] [image: image.png] Running Node 4.2.8, should the kernel parameter be enough, or do I need to edit a conf file on the host? On Fri, Feb 15, 2019 at 9:41 AM Michal Skrivanek < [email protected]> wrote: > > > On 15 Feb 2019, at 18:17, Vincent Royer <[email protected]> wrote: > > Thanks, I saw that article and it is a hit helpful, but still I don't see > how I can tell how many huge pages and of which size my host supports in > the first place. > > > 2M and 1G on x86 > > > Do all hosts support a certain number, is this calculated by available > RAM? > > > No, it’s just what linux kernel and hw architecture support > > > How do I know what size and amount to specify in the kernel command line? > > > Amount is on you. Hugepages are generally unusable for other normal apps. > It’s a matter of flexibility. You need to leave enough available 4k pages > for maintenance processes for OS to work. I’d leave few GBs at least... > Or if you plan to use it for just one VM and not for others then just size > it according to that VM’s needs > > Thanks, > michal > > > > > On Fri, Feb 15, 2019, 2:35 AM Martin Sivak <[email protected] wrote: > >> Hi, >> >> the hugepages configuration has two aspects - hugepage size and count. >> You can have multiple sizes at the same time. I am not sure what the >> recommended configuration is or how to pass it to kernel so others will >> have to help here (I think 2M and 1G are the usual sizes). >> >> The VM memory configuration is then taken from two places. The custom >> property tells oVirt which size of hugepages you want to use (in KiB iirc) >> and the actual number of used hugepages is computed from the total memory >> configured for the VM at the usual place (it has to be a multiple of the >> selected hugepage size). >> >> One of our colleagues wrote a blog post about this: >> https://mpolednik.github.io/2017/06/26/hugepages-and-ovirt/ >> >> Best regards >> >> Martin Sivak >> >> On Fri, Feb 15, 2019 at 5:35 AM Vincent Royer <[email protected]> >> wrote: >> >>> How do I know how many huge pages my hosts can support? >>> >>> cat /proc/meminfo | grep Huge >>> AnonHugePages: 17684480 kB >>> HugePages_Total: 0 >>> HugePages_Free: 0 >>> HugePages_Rsvd: 0 >>> HugePages_Surp: 0 >>> Hugepagesize: 2048 kB >>> >>> [image: image.png] >>> >>> And once I know, I set the kernel parameters here, and reboot the host, >>> correct? >>> >>> [image: image.png] >>> >>> >>> And then I assume I assign them to the VM here? How do I decide how >>> many huge pages and what size a particular VM can benefit from? >>> >>> <image.png> >>> >>> >>> Is there a part of the docs I am not finding that covers this? >>> _______________________________________________ >>> Users mailing list -- [email protected] >>> To unsubscribe send an email to [email protected] >>> Privacy Statement: https://www.ovirt.org/site/privacy-policy/ >>> oVirt Code of Conduct: >>> https://www.ovirt.org/community/about/community-guidelines/ >>> List Archives: >>> https://lists.ovirt.org/archives/list/[email protected]/message/ZMGN7YZXSQ5UUZ43U5RPSXTZOTYI2XAZ/ >>> >> _______________________________________________ > Users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/[email protected]/message/O43AJBFDCCDCDGB53IZRH5ROFX4FWPIF/ > >
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