Re: Why systemd-nspawn is slower than docker, podman and qemu?! how to Improve nspawn performance?

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Tomasz Torcz

In fact I m just comparing containers, I have no need yet for context switch, but I hope to understand why nspawn is slower and if there is something I can do to improve it, for example disabling spectre/meltdown mitigations improved nspawn a lot, so I was wondering if there is something else I can do to make nspawn as quick as podman/docker/qemu.

Mantas Mikulėnas

I tested with  Export SYSTEMD_SECCOMP=0
no improvement, I still get the same result
thank you,
badr

On Mon, Jan 25, 2021 at 1:40 PM Badr Elmers <badrelmers@xxxxxxxxx> wrote:
I tested with  Export SYSTEMD_SECCOMP=0
no improvement, I still get the same result
thank you,
badr

On Mon, Jan 25, 2021 at 1:14 PM Mantas Mikulėnas <grawity@xxxxxxxxx> wrote:
On Mon, Jan 25, 2021, 12:56 Badr Elmers <badrelmers@xxxxxxxxx> wrote:
Hi,
Why nspawn is slow compared to docker podman and even qemu?! 
CPU tasks take twice of the time it takes in docker, podman or qemu 

here I filled a request to improve nspawn performance which contain the steps and the full test result: https://github.com/systemd/systemd/issues/18370

Do you know why systemd-nspawn is slower? how can I improve it?

thank you



Have you tried completely *disabling* the syscall filtering and all other seccomp-based features? Export SYSTEMD_SECCOMP=0 before running nspawn and check if it makes any difference...
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