Artix Linux Forum

Artix Linux => System => Topic started by: l3u on 29 July 2023, 22:00:14

Title: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core
Post by: l3u on 29 July 2023, 22:00:14
Hi devs!

Using Akonadi 5.23.3, I get a persistent iowait load of 100 % on one CPU core. I see this on two different machines running this version on Artix Linux. Stopping the Akonadi server makes the load drop to 0 %. Deleting the ~/.local/share/akonadi cache and rebuilding it did not solve the problem. The iowait load stays at 100 % for one core all the time.

I don't see this on my Gentoo machine running Akonadi 5.23.2, and also not on another Artix machine running this version.

I was pretty sure that this was an Akonadi issue. But this is actually a kernel bug. The machines running the older Akonadi version also run an older kernel.

Happens with 6.4.6, does not happen with 6.4.2. Nothing else changed, only booted the older kernel.

Should be https://lore.kernel.org/all/CAMEGJJ3SjWdJFwzB+sz79ojWqAAMULa2CFAas0tv+JJLJMwoGQ@mail.gmail.com/

I have not enough knowledge about what has to be done, or what implications the proposed patch (or the non.applying of some patch) has, but I'm sure you know ;-)

Cheers, Tobias
Title: Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core
Post by: Hitman on 29 July 2023, 23:49:21
6.4.7 has some stuff regarding that patch, try and wait for it to arrive and see.
My oh my this kernel series has been strange...
Title: Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core
Post by: l3u on 30 July 2023, 11:04:35
Thanks for the insight! The downgrade works for now, so there's no real problem at the moment. Let's see if 6.4.7 fixes this.
Title: Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core
Post by: l3u on 04 August 2023, 17:27:44
It doesn't :-( Still the same with 6.4.7-artix1-3 …
Title: Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core
Post by: nous on 05 August 2023, 15:12:40
Another fsckup by the 6.x-series kernel, color me surprised. It might get stable by 6.12.18, patience.
Title: Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core
Post by: l3u on 07 August 2023, 14:00:39
I simply skip the kernel updates and keep 6.4.2, which still works fine ;-) Thanks for the update about this!
Title: Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core
Post by: l3u on 14 August 2023, 22:32:54
Just FYI: The same problem now arised on Gentoo. The stable kernel is a bit more conservative, so the versions are a bit older. But with 6.1.38, everything is fine, whereas on 6.1.41, it's the very same issue.

Seems like it's a come and go problem :-(
Title: Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core
Post by: l3u on 16 August 2023, 23:46:16
Seems to be fixed in 6.4.10 :-)