[pve-devel] qemu + tcmalloc for rbd

DERUMIER, Alexandre alexandre.derumier at groupe-cyllene.com
Tue Jan 9 18:02:28 CET 2024


I still have this last year patch pending


to enabled conditionnaly tcmalloc in qemu 

It's still required for performance with librbd with last qemu /lirbd
I get a 30-40% performance boost in iops and latency for small

I would like to have a solution in proxmox repo, instead of maintain it
on my side.

Currently, In production, I compile qemu with tcmalloc at build.

This patch serie, allow to do use LD_PRELOAD +  disable malloc_trim()
call in qemu.

I'm not expert in C (I re-used code from haproxy, which is doing
exactly the same thing with tcmalloc && trim). 
So if somebody can review it, it could be great :)

Another way (maybe safer), is to build 2 binary in same package 
(/usr/bin/kvm-tcmalloc  && /usr/bin/kvm), and give option to user to
choose it.

More information about the pve-devel mailing list