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Topic: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core (Read 987 times) previous topic - next topic
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Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core

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
 

Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core

Reply #1 –
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...

Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core

Reply #2 –
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.

Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core

Reply #3 –
It doesn't :-( Still the same with 6.4.7-artix1-3 …

Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core

Reply #4 –
Another fsckup by the 6.x-series kernel, color me surprised. It might get stable by 6.12.18, patience.

Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core

Reply #5 –
I simply skip the kernel updates and keep 6.4.2, which still works fine ;-) Thanks for the update about this!

Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core

Reply #6 –
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 :-(

Re: Kernel 6.4.6 causes Akonadi to cause 100 % iowait load on one core

Reply #7 –
Seems to be fixed in 6.4.10 :-)