Linux: Excessive number of "bioset" kernel processes in 4.4 kernel
Since upgrading to kernel 4.4.7 (and now 4.4.8) on an otherwise stock 2016-03-18-raspbian-jessie-lite I have 25 kernel processes named bioset showing in top output, each with a nice priority of -20, e.g.:
60 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 bioset
This happens on an RPi B+, RPi2 and RPi3, all run headless. As I didn't see this on the 4.1 kernel, am I to assume this is not desired behaviour?
ncguk
All 4 comments
Seems like a kernel working thread involved in block I/O. See:
https://answers.launchpad.net/ubuntu/+question/272922
I don't think there is any issue. It takes no CPU when it is not in use.
popcornmix
on 23 Apr 2016
It's true they don't seem to consume CPU or RAM. It's odd, though, isn't it, that they weren't there in 4.1 and now are in 4.4?
ncguk
on 23 Apr 2016
That is a decision the upstream kernel developers have taken.
If you search around for bioset you can see these kernel threads are present on all platforms with newer kernels. I can find no evidence that there is a problem with that.
popcornmix
on 23 Apr 2016
Fair enough. I'll close the ticket.
ncguk
on 23 Apr 2016
Related issues
XECDesign
·
6Comments
ensarkarabudak
·
7Comments
pymumu
·
4Comments
thomasklingbeil
·
4Comments
kucharskim
·
7Comments
Most helpful comment
That is a decision the upstream kernel developers have taken.
If you search around for bioset you can see these kernel threads are present on all platforms with newer kernels. I can find no evidence that there is a problem with that.