why MDADM runs with priority 10 (nice -5)?

alirezan1 · 03-16-2009, 06:35 PM

Hi

I just wanted to know if there's any specific reason why MDADM runs with PRI of 10 (NI of -5)? It seems to be eating up all the process time from my other processes like DRBD and all that which run with PRI of 15 (NI=0).

Can I safely lower the PRI of MDADM without affecting anything critical?

Thanks

AlucardZero · 03-16-2009, 08:28 PM

It's your software RAID. I wouldn't touch it.

alirezan1 · 03-17-2009, 12:50 PM

Quote:

Originally Posted by AlucardZero

It's your software RAID. I wouldn't touch it.

Thanks for the reply. I know it's software RAID, but why not? Would it cause unexpected behavior or what? Can you please explain abit more?

AlucardZero · 03-17-2009, 03:12 PM

Because it's important. If you think it's taking up to much CPU, try making sure it's updated to the latest level via your distro's package manager and see if that helps.

syg00 · 03-17-2009, 06:02 PM

Simply put, any software layer that interposes itself between applications and the physical hardware need to run at higher priority than the applications else queueing occurs at the software layer when requests come in from the higher priority client. Everybody suffers then.

Don't f*ck with it.