On Wed, Aug 27, 2014 at 3:32 AM, Fabien COELHO <coe...@cri.ensmp.fr> wrote:
> > Hello Andres, > > [...] >> >> I think you're misunderstanding how spread checkpoints work. >> > > Yep, definitely:-) On the other hand I though I was seeking something > "simple", namely correct latency under small load, that I would expect out > of the box. > > What you describe is reasonable, and is more or less what I was hoping > for, although I thought that bgwriter was involved from the start and > checkpoint would only do what is needed in the end. My mistake. > > If all you want is to avoid the write storms when fsyncs start happening on slow storage, can you not just adjust the kernel vm.dirty* tunables to start making the kernel write out dirty buffers much sooner instead of letting them accumulate until fsyncs force them out all at once? > a. -- Aidan Van Dyk Create like a god, ai...@highrise.ca command like a king, http://www.highrise.ca/ work like a slave.
