On Mon, Oct 13, 2014 at 11:27:20AM -0400, Mikulas Patocka wrote: > Hi > > I'm announcing the release of a patchset that limits the number of > outstanding bios in the device mapper. Interesting; Mike and I were considering this for throttling io to thinp a couple of weeks ago. The reason we didn't go with this was, for thinp, there are cheap bios (eg, a quick remap) and expensive bios (eg, one that triggers a copy on write exception). This means it's very hard to come up with a single number that represents too many bios. Instead I throttle by looking at how long it's taking the worker thread to get through it's work queue. Could you make this limit optional please? eg, setting the limit to 0 turns it off, and I'd prefer a default of 0/off. - Joe -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
