[dm-devel] [PATCH v5 01/11] block: make generic_make_request handle arbitrarily sized bios

[Christoph Hellwig]

On Thu, Aug 06, 2015 at 05:00:04PM -0700, Kent Overstreet wrote:
> Why is it that we don't want to send giant discards? Is it a latency issue?

Yes.  Take a look at the "Configurable max discard size" thread(s).