Comment 699 for bug 595047

As far as I understand, this is kind of meta-bug: there are multiple causes and multiple fixes.

"I do bulk IO and it gets slow" sounds rather general, and problem that can resurface anytime due to some new underlying issue. So the problem cannot be really "closed for good" no matter how much technical progress is made.

For me 12309 basically stopped happening unless I deliberately tune "/proc/sys/vm/dirty_*" values to non-typical ranges and forgot to revert them back. I see system controllably slowing down processes doing bulk IO so the system in general stays reasonable. This behaviour is one of outcomes of this bug.

I don't expect meaningful technical discussion to be happen in this thread. It should just serve as a hub for linking to specific new issues.