Hi trying to get similar performance on my local docker as i rancher-users #rancher-desktop

Title

clean-pager-20838

11/03/2022, 12:05 AM

Hi. trying to get similar performance on my local docker as i get on my production k8s cluster... but i think i'm not understanding the rd x lima relation... some questions in case anyone want to chime in

first, i configured it on the rd UI to use 6 CPUs, 16GB ram... but

limactl info

shows

"cpuType": {
            "aarch64": "cortex-a72",
            "riscv64": "rv64",
            "x86_64": "host"
        },
        "cpus": 4,
        "memory": "4GiB",

i'm on x86_64

shouldn't those values match the UI?

seems that limactl info is buggy.. on limactl shell i do see 6 cpus identical to my host (minus some flags)

it reports MORE cpu cache in the vm though. can this cause worse performance?

and 100 more bogomips too 😅

fast-garage-66093

11/03/2022, 12:15 AM

limactl info

shows the settings from the

default.yaml

template. You should use

limactl ls

to inspect the settings of a specific instance.

clean-pager-20838

11/03/2022, 12:15 AM

oh. thanks!

does the CPU type mismatches may cause problems? fearing i might be harming qemu vritualization somehow

fast-garage-66093

11/03/2022, 12:17 AM

Well, in general you should not use

limactl

to interact with the RD instance, but it is ok if you know what you are doing, and are careful. E.g. you cannot use

limactl start

on the RD instance and expect it to start up the same way it would as if RD controlled it.

How do you detect the CPU mismatch?

clean-pager-20838

11/03/2022, 12:17 AM

good to know! i'm just probing things with limactl

i compared

/proc/cpu

on the host and inside

rdctl shell

fast-garage-66093

11/03/2022, 12:19 AM

idk, if you run

ps -ef | grep qemu

, do you see that it runs with

-cpu host

It should, and in that case any discrepancy would be due to whatever qemu is doing on your machine

Since you have

/proc/cpu

on the host, I assume you are on Linux. Are you using a recent version of

qemu

clean-pager-20838

11/03/2022, 12:20 AM

emu-system-x86_64 -m 16384 -cpu host -machine q35,accel=kvm -smp 6,sockets=1,cores=6,threads=1

no :( stuck on an old ubuntu version

QEMU emulator version 4.2.1 (Debian 1:4.2-3ubuntu6.23)

that's from 2019 i guess. ubuntu 20.04 is the standard enterprise image we can use

fast-garage-66093

11/03/2022, 12:22 AM

The command looks fine; so I don't know if there is anything else to do if you are stuck with that version of qemu

Note that I don't know if a more recent version performs better

clean-pager-20838

11/03/2022, 12:23 AM

true. i will try to compile a bleeding edge one. worth the shot. if that is the solution i can think how to publish it to other devs

👍 1

thank you

fast-garage-66093

11/03/2022, 12:24 AM

You are welcome

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