Re: [PATCH pve-qemu 0/2] Re-enable tcmalloc as the memory allocator

DERUMIER, Alexandre
2026-04-10T10:45:00Z

>>How does the performance change when doing IO within a QEMU guest?
>>
>>How does this affect the performance for other storage types, like
>>ZFS,
>>qcow2 on top of directory-based storages, qcow2 on top of LVM, LVM-
>>thin,
>>etc. and other workloads like saving VM state during snapshot,
>>transfer
>>during migration, maybe memory hotplug/ballooning, network
>>performance
>>for vNICs?

Hi Fiona,

I'm stil running in production (I have keeped tcmalloc after the
removal some year ago from the pve build), and I didn't notice problem.
(but I still don't use pbs).

But I never have done bench with/without it since 5/6 year.

Maybe vm memory should be checked too, I'm thinking about RSS memory
with balloon free_page_reporting, to see if it's correcting freeing
memory.