~20% PCIe SSD Slowdown in 10.13.5 vs 10.11

[handheldgames]

Running updated benchmarks for low level 4k performance, I've discovered an observable slow down in AHCI PCIe SSD performance. Old and new results are shared below... Perhaps the drop in performance is the result of patches for the Specter/Meltdown at the OS level. Unfortunately read and write speed is effected, no both drives tested.

10/2015 - ElCapitan - combined results

6/2018 XP941

6/2018 Apple 1TB SSUAX

 

[Synchro3]

Cannot confirm a slowdown in 10.13.5 (However, I avoided the APFS format)

Apple SSUBX

 

[crjackson2134]

- - -

 

[eksu]

Can you control more variables before we jump to conclusions? i.e. run the test on the same drives in 10.11 today

That way you can control for ssd degredation, control for Filesystem (unlabeled in 1st photo) control for how full the drive is, control for cpu microcode, control for other PCIe devices, etc?

 

[bsbeamer]

With APFS on non-Apple issued SSD, I was getting very slow read/write speeds back in 10.13.2 (one of the builds). Changed to HFS+ via Carbon Copy Cloner and all problems went away. I do not recommend APFS for 5,1 with non-Apple issued SSDs.

 

[handheldgames]

Cannot confirm a slowdown in 10.13.5 (However, I avoided the APFS format)

Apple SSUBX

View attachment 765260

Matching up with syncro3's and my legacy results, I forgot to click [x] Allow Asynchronous I/O.

Booting back into ElCap to verify, read performance on the xp941 looks good. Write performance consistently scales across multiple tests.


Back to High Sierra, read performance looks good but write performance is inconsistent. With the XP941 slowing down faster more times than not.

 

[crjackson2134]

SSD performance is the same for me as it always has been on my SSUBX. Both file systems yielding same results as when originally installed. I can't remember if it was Cappy, or Yose, but my performance is the same.