On Mon, 2013-08-19 at 10:00 -0400, Mike Snitzer wrote: > Performance isn't the concern. The concern is: does DM allow for > forward progress if the system's memory is completely exhausted? > > This is why request-based has such an extensive reserve, because it > needs to account for cloning the largest possible request that comes in > (with multiple bios). Thanks for the response. In our particular case, I/O will be file system based and over a network, which makes it pretty easy for us to be sure that large I/Os never happen. That notwithstanding, however, as you said it just seems reasonable to make these values configurable. I'm also looking at making some similar constants in dm-verity and dm-bufio configurable in the same way and for similar reasons. -- Frank Mayhar 310-460-4042 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
