* [pve-devel] auto ballooning && ksm thresholds both at 80%
@ 2021-12-30 10:47 DERUMIER, Alexandre
0 siblings, 0 replies; 3+ messages in thread
From: DERUMIER, Alexandre @ 2021-12-30 10:47 UTC (permalink / raw)
To: pve-devel
Hi,
I'm still working on ha manager ressource aware && loadbalancing (I
have some big improvements to send soon before review)
I currently looking at memory balancing doing a lot of tests,
and I wonder if auto-ballooning threshold shouldn't be a little bit
bigger than ksm.
Currently both are at 80%,
that mean that ballooning is vm reducing memory fast, and ksm don't
have time to run.
as ballooning is a lot more intrusive than ksm, I wonder if it couldn't
be set to something like 90%.
Like this, ksm can try to keep memory at 80%, and if memory is growing
too fast up to 90% or if ksm can't really deduplicate pages anymore, we
have ballooning in action.
What do you think about it ?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [pve-devel] auto ballooning && ksm thresholds both at 80%
2021-12-31 14:31 Dietmar Maurer
@ 2022-01-03 8:20 ` DERUMIER, Alexandre
0 siblings, 0 replies; 3+ messages in thread
From: DERUMIER, Alexandre @ 2022-01-03 8:20 UTC (permalink / raw)
To: pve-devel, dietmar
Le vendredi 31 décembre 2021 à 15:31 +0100, Dietmar Maurer a écrit :
Currently both are at 80%,
that mean that ballooning is vm reducing memory fast, and ksm don't
have time to run.
as ballooning is a lot more intrusive than ksm, I wonder if it couldn't
be set to something like 90%.
That sounds reasonable to me, but can you see that theoretical effect when you run your test?
Hi Dietmar,
Happy new year ! (I'm currently in holiday this week, so, I check that next week)
I'll do more tests to be sure. (I don't use ballooning in production, but I'm a big user of ksm, I have some big nodes with something like 200GB ksm on 700GB servers).
My Idea behind this is to implement auto-balancing, vm migration, when memory threshold is between ksm && autoballoonig).
1) 80%: ksm
2) ~= 85-89% : auto balancing/migration
3) ~= 90% : auto ballonning
4) ~= 100% : swap
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [pve-devel] auto ballooning && ksm thresholds both at 80%
@ 2021-12-31 14:31 Dietmar Maurer
2022-01-03 8:20 ` DERUMIER, Alexandre
0 siblings, 1 reply; 3+ messages in thread
From: Dietmar Maurer @ 2021-12-31 14:31 UTC (permalink / raw)
To: Proxmox VE development discussion, DERUMIER, Alexandre
> Currently both are at 80%,
> that mean that ballooning is vm reducing memory fast, and ksm don't
> have time to run.
>
> as ballooning is a lot more intrusive than ksm, I wonder if it couldn't
> be set to something like 90%.
That sounds reasonable to me, but can you see that theoretical effect when you run your test?
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-12-30 10:47 [pve-devel] auto ballooning && ksm thresholds both at 80% DERUMIER, Alexandre
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2022-01-03 8:20 ` DERUMIER, Alexandre
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