On 17-06-21 03:35 PM, Jason Dillaman wrote:
On Wed, Jun 21, 2017 at 3:05 AM, Piotr Dałek <piotr.dalek@xxxxxxxxxxxx> wrote:
I saw that RBD (librbd) does that - replacing writes with discards when
buffer contains only zeros. Some code that does the same in librados could
be added and it shouldn't impact performance much, current implementation of
mem_is_zero is fast and shouldn't be a big problem.
I'm pretty sure the only place where librbd converts a write to a
discard is actually the specialized "writesame" operation used by
tcmu-runner, as an optimization for ESX's initialization of a new
image.
Still, I saw it! ;-)
--
Piotr Dałek
piotr.dalek@xxxxxxxxxxxx
https://www.ovh.com/us/
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