[Starlingx-discuss] Question - Using 1Gb mem pages

[Perez, Ricardo O]

Hi team, any idea about what is missing here ? 

Thanks
_Richo

> -----Original Message-----
> From: Perez, Ricardo O [mailto:ricardo.o.perez at intel.com]
> Sent: Friday, October 19, 2018 5:14 PM
> To: Michel Thebeau <michel.thebeau at windriver.com>; starlingx-
> discuss at lists.starlingx.io
> Subject: Re: [Starlingx-discuss] Question - Using 1Gb mem pages
> 
> Hi Michael,
> 
> Thanks for your answer, I just forgot to put the computes information about
> memory configuration, here is the info:
> 
> Compute-0
> 
>    VM Pages
> 0   Reserved for Platform: 8000 MiB
> Usable Total: 86387 MiB
> Available: 84787 MiB
>     4K Pages:
>     Total: 230656
> 2M Hugepages:
>     Total: 1271
>     Available: 983
> 1G Hugepages:
>     Total: 80
>     Available: 80
> 
> 1   Reserved for Platform: 2000 MiB
> Usable Total: 93698 MiB
> Available: 92674 MiB
>     4K Pages:
>     Total: 29696
> 2M Hugepages:
>     Total: 5319
>     Available: 5319
> 1G Hugepages:
>     Total: 80
>     Available: 80
> 
> ***********************************
> Compute-1
> Processor
>     Memory
>     VM Pages
> 0   Reserved for Platform: 8000 MiB
> Usable Total: 86504 MiB
> Available: 84968 MiB
>     4K Pages:
>     Total: 0
> 2M Hugepages:
>     Total: 1780
>     Available: 1524
> 1G Hugepages:
>     Total: 80
>     Available: 80
> 
> 1   Reserved for Platform: 2000 MiB
> Usable Total: 93552 MiB
> Available: 92528 MiB
>     4K Pages:
>     Total: 0
> 2M Hugepages:
>     Total: 5304
>     Available: 5304
> 1G Hugepages:
>     Total: 80
>     Available: 80
> 
> Am I missing something else to made use of 1G memory pages ?
> 
> Thanks
> -Richo
> 
> > -----Original Message-----
> > From: Michel Thebeau [mailto:michel.thebeau at windriver.com]
> > Sent: Friday, October 19, 2018 1:39 PM
> > To: Perez, Ricardo O <ricardo.o.perez at intel.com>; starlingx-
> > discuss at lists.starlingx.io
> > Subject: Re: [Starlingx-discuss] Question - Using 1Gb mem pages
> >
> > On 2018-10-19 1:45 p.m., Perez, Ricardo O wrote:
> > > Hello,
> > >
> > > I'm trying to execute a test, which his goal is to made use of huge
> > > pages (2M /
> > 1G) launching a VM.
> > >
> > > I have already verified the configuration of the controllers GRUB
> > > options and
> > we have defined the variable hugepagesz=1G, however, inside the same
> > parameters list, there is a "default_hugepagesz=2M". The default
> > hugepagesz, has been modified to 1G, and the compute has been restarted
> with no issues.
> >
> >
> > Hi Ricardo,
> >
> > You wrote, "controllers GRUB options" then "the compute has been
> > restarted with no issues".  Is there a GRUB option one can configure
> > on the controller that is for the computes?  I don't remember seeing
> > one. If you're actually changing /etc/default/grub, I doubt that's supported.
> > I did not find a procedure for changing default_hugepagesz  on
> > controllers or computes grub configuration.
> >
> > It's supposed to be an option, for example through in horizon
> > interface or 'system host-memory-modify'... but you didn't quote either of
> those.
> >
> >
> > >
> > > The flavor has been modified, with the following option: "
> > hw:mem_page_size=104875"  (1G) page.
> >
> >
> > Is "104875" a typo?  It looks a lot like 1024 * 1024 = 1048576, but
> > not quite.
> >
> >
> > M
> >
> >
> > >
> > > However when I launch a VM using the modified flavor it creates the
> > > VM, but if
> > I check the field values of the VM using " openstack server show <vm_name>".
> > I'm getting the following value for pgsize:
> > > wrs-res:topology                    | node:0,   512MB, pgsize:2M, vcpus:0, pol:sha |
> > >
> > > So, seems like it's still taking the 2M pagesize instead of the 1G.
> > >
> > > What I have already tried is to:
> > >
> > > *        Change also the image metadata: hw:mem_page_size=large and also
> > 104875. Result, VM launched successfully, but pgsize value still 2M.
> >
> > There's the interesting "104875" again.
> >
> >
> > > *        Leave the GRUB default values, and use modified flavor to
> > hw:mem_page_size=104875, launch the VM with ERROR status.
> >
> > 104875
> >
> > > *        Leave the GRUB default values, and use modified flavor to
> > hw:mem_page_size=2048, launch the VM with success, , pgsize value is
> > 2M, which is expected, ok.
> > >
> > > *        Leave the GRUB default values, and use modified flavor to
> > hw:mem_page_size=small launch the VM with success, , pgsize value is
> > 4k, which is  expected, ok.
> > >
> > > *        Leave the GRUB default values, and use modified flavor to
> > hw:mem_page_size=any launch the VM with success, , pgsize value is 2M,
> > which is  expected, ok.
> > >
> > > Could be this an issue trying to use 1G mem pages or do I'm missing
> > > some
> > other configuration parameter?
> > >
> > > Thanks in advance for your help
> > >
> > >
> > > _______________________________________________
> > > Starlingx-discuss mailing list
> > > Starlingx-discuss at lists.starlingx.io
> > > http://lists.starlingx.io/cgi-bin/mailman/listinfo/starlingx-discuss
> 
> 
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