severe audio player glitches when compiling from source (both cpus 100%). same when mp3gaining files. setting higher priority won't help. seem to be disk usage related somehow even if listening to online radio (no disk cache). stock kernel all OK
As I said in the last post, I can't deny i've seen some odd behaviour since the last update (although my usual test still yielded the result i expect for BFQ vs CFQ) ...although not what you describe.
It would be good if you can try using the stress command and then doing other tasks to see if the problem is replicated.
For example, for me on my quad-core i run
stress --cpu 4 --hdd 1 which starts 4 processes hogging CPU cores and one smashing the current drive's I/O. This is usually a way to show how much better BFS+BFQ is. Even now my system does still open apps, play media and respond to user input like it's idle, where as with that stress command running on the normal kernel my system becomes sluggish... however, as I said, i do have some oddities since the last update, like the first time pacman is run after a reboot (the initial database load) will cause playing media to stutter on BFS+BFQ but not on normal.
*shrugs*
All I can say is don't run this for now if it's causing you problems, wait for these things to be fixed upstream.
Despite some currently oddities, It still does provide massive benefits for me, on my main system, with the type of workloads i have.