[pve-devel] qemu memory hotplug limited to 64 dimm
Alexandre DERUMIER
aderumier at odiso.com
Tue Dec 13 19:34:07 CET 2016
>>Why is that patch not applied to upstream? Maybe we can ask on the kernel list?
>From what I have read, they are an performance impact with more than 64 dimm,
and until they have fixed it, they don't want to increase value
https://patchwork.kernel.org/patch/5825741/
"I'm almost done with approach suggested by Paolo,
i.e. replace linear search with faster/scalable lookup alg.
Hope to post it soon.
"
We can simply add a file:
/etc/modprobe.d/vhost.conf
options vhost max_mem_regions=509
But, as Wolfgang, I also think that be able to define optional fixed dimm size could be great too.
----- Mail original -----
De: "dietmar" <dietmar at proxmox.com>
À: "Wolfgang Bumiller" <w.bumiller at proxmox.com>
Cc: "aderumier" <aderumier at odiso.com>, "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mardi 13 Décembre 2016 16:37:41
Objet: Re: [pve-devel] qemu memory hotplug limited to 64 dimm
> > Any drawbacks?
>
> It's a hack... I find the idea of configuring the dimm size more
> appealing. Why would you want a huge amount of tiny DIMMs in a VM,
Because it works out of the box (for the users) ...
> especially if it means kernel-patching... ? :|
Why is that patch not applied to upstream? Maybe we can ask on the kernel list?
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