Bit of a newb here.

I am trying to figure out why ubuntu 18.04 lts has a higher performance than debian buster 4.19.16-1

both are aarch64

both are running on the same hardware (same machine, no, not at the same time).

when I run sysbench they both return the same results.

Bit of a newb here.

I am trying to figure out why ubuntu 18.04 lts has a higher performance than debian buster 4.19.16-1

both are aarch64

both are running on the same hardware (same machine, no, not at the same time).

when I run sysbench they both return the same results.

Look at this definitive article from phoronix.com regarding the degradation in performance with Linux kernels since 4.13.

A Look At The Linux Kernel Performance From 4.10 To 4.20 Benchmarks

Mainly it has to do with the performance killing security additions for Spectre/Meltdown vulnerabilities.

The highest performance distro consistently is IBM's Clear Linux.

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Bit of a newb here.

I am trying to figure out why ubuntu 18.04 lts has a higher performance than debian buster 4.19.16-1

both are aarch64

both are running on the same hardware (same machine, no, not at the same time).

when I run sysbench they both return the same results.

What hardware are you running for that?

Is the performance difference that for example Ubuntu supports the ARM neon hardware maths acceleration whereas Debian might not?

If both do support full hardware maths, then indeed a good guess as mentioned is that the Spectre mitigations are slowing things down a little...

What sort of performance difference are you seeing? (Note that the Cobblestones are only a very rough estimate that can change depending on what else the system is doing during the test...)


Happy cool crunchin',
Martin

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I don't know how to tell if either of the OSes are using NEON, I thought I read somewhere it is now part of the kernel. Both of these OS have been running on a raspberry pi 3.

when I cat the cpuinfo both report the same

Features: fp asimd evtstrm crc32 cpuid (same for both ARM64/AARCH64 oses)

Features: half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 (RASPIAN ARMHF)

I have a stack of raspberry pies 3/3+, and was trying to increase efficiency. I also have other boards in the mail. ROCK64 and NanoPI FIRE 3, which has 8 cores.

if the 64bit versions show and increase performance over 32bit then I will update all the 64bit to ubuntu