A Fix Is Pending For That Linux 5.15 Performance Regression

[phoronix]

Phoronix: A Fix Is Pending For That Linux 5.15 Performance Regression

Last week was the article on noticing various workloads performing slower on the Linux 5.15 development kernel. There is now a patch pending that in testing so far does indeed correct the performance drop on this forthcoming kernel.

https://www.phoronix.com/vr.php?view=30536

[perpetually high]

Awesome work, Michael. You rock. (and everyone else that contributes, not just to this bug, but to every bug. We can't give kudos to every person, nor should you do *anything* for the kudos. Just do it, to do it.)

From the patch creator Shakeel:

From the above result, it seems like the option-2 not only solves the regression but also improves the performance for at least these benchmarks.

🔥🔥🔥

(edit: Added the patch to the Ubuntu build kernel script if anyone needs)

(edit 2: more good news. It fixed a bunch of the slowdowns I mentioned in that previous thread on pts/osbench:
https://openbenchmarking.org/result/...TJ-OSBENCHSE61

too lazy; didn't click:

Geometric Mean Of All Test Results
Result Composite - osbench-sept-2021
Geometric Mean > Higher Is Better

5.14.7 gcc-9.3.0-17ubuntu120.04 .......... 4.404
[B]5.15-rc2 gcc-9.3.0-17ubuntu120.04 ........ 4.574[/B]
5.4.147 gcc-7.5.0-6ubuntu2 ............... 4.615
5.4.147 gcc-11.1.0-1ubuntu120.04 ......... 4.632
[B]5.15-rc2 gcc-9 after patch ............... 4.635[/B]
5.4.147 gcc-8.4.0-3ubuntu2 ............... 4.653
5.4.147 gcc-10.3.0-1ubuntu120.04 ......... 4.676
5.4.148 gcc-9.3.0-17ubuntu120.04 ......... 4.693
5.4.147 gcc-9.3.0-17ubuntu120.04 ......... 4.715

Fixed Create Processes test:


Great work again, Shakeel and Michael.

[Azrael5]

good job!

[Termy]

Thank you for your involvement in this! (and any other issues you find an report of course ^^)

[Steffo]

This is one big reason, why Phoronix readers should buy a premium account or at least disable ad-blocker!

[perpetually high]

This is one big reason, why Phoronix readers should buy a premium account or at least disable ad-blocker!

It's the least they could do, and I *guaran-damn-tee* they won't do it. Those are some of the type of people that frequent the Phoronix forums. Linux invites those kinds of people, just how it is. Hate that I have to be that nasty prick to say that.

Am I wrong? They use NoScript, block every damn ad (I do too, shout out to pi-hole). God forbid they give back a little to Michael by either

a) small 1 or 2 dollar donations on a post they like, b) buying a Lifetime subscription on sale (it's Oktoberfest right now), or c) disabling ad-blocker

Let's see. I gave people 3 ways to help out. One is free, the other cost a dollar, the other one is way more but way cool. No ads, all posts are one single page unless it's a huge thread. Many other benefits. Early release to threads. Premium is definitely worth it.

Michael if I can make a small, special request for a title next to my name. Instead of Senior Member, maybe Lifetime Member or "High All The Time" Please consider.