[nova] Slow nvme performance for local storage instances

Sven Kieske kieske at osism.tech
Tue Aug 22 10:01:20 UTC 2023


Am Montag, dem 21.08.2023 um 15:06 +0200 schrieb Jan Wasilewski:
> Hi,
> 
> Let me add a few points. Lastly, I decided to conduct a couple of
> tests
> with the newer OpenStack platform - Zed (built by the kolla-ansible
> project). This platform serves Ubuntu 22.04 LTS on top of my compute
> nodes.
> The results were surprising, particularly because I was able to
> achieve the
> desired outcomes.

Hi, my bad.

I asked two times about your kernel versions, but I failed to state
_why_
and I guess we can see here why I asked: newer kernels - in general -
have improved performance, especially when it comes to relatively new
hardware like NVMe SSD.

Your Ubuntu 22.04 should be on a 5.19 based kernel which saw a lot of
improvements in the nvme and block area[0].

This is why I asked to run latest stable kernel.org LTS Kernel, to rule
out kernel bottlenecks which can often be solved by upgrading.

[0]:
https://lore.kernel.org/linux-block/83ce22b4-bae1-9c97-1ad5-10835d6c5424@kernel.dk/

HTH

-- 
Sven Kieske
Senior Cloud Engineer

Mail: kieske at osism.tech
Web: https://osism.tech

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