Comment 132 for bug 595047

Basically all of them show waiting for an async page write to finish, and that can take quite a bit of time with heavy writing going on. First thing next week I'll try and provide a 'this async write now went sync' helper for the io scheduler, so that they can make sure it gets expedited as soon as the sync io is. This should drastically reduce latencies for this situation.

I'll probably be less than straight forward, but a test patch should be quite doable.