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.
Do all hosts support a certain number, is this calculated by available RAM? How do I know what size and amount to specify in the kernel command line? On Fri, Feb 15, 2019, 2:35 AM Martin Sivak <msi...@redhat.com 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 <vinc...@epicenergy.ca> > 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: image.png] >> >> >> Is there a part of the docs I am not finding that covers this? >> _______________________________________________ >> Users mailing list -- users@ovirt.org >> To unsubscribe send an email to users-le...@ovirt.org >> 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/users@ovirt.org/message/ZMGN7YZXSQ5UUZ43U5RPSXTZOTYI2XAZ/ >> >
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