Re: [Drbd-dev] [PATCH 04/30] drbd: Implement handling of thinly provisioned storage on resync target nodes

From: Bart Van Assche
Date: Mon Apr 25 2016 - 11:29:03 EST


On 04/25/2016 05:10 AM, Philipp Reisner wrote:
If during resync we read only zeroes for a range of sectors assume
that these secotors can be discarded on the sync target node.

Hello Phil,

With which interconnect(s) has this patch been tested? I'm afraid that for high-speed interconnects this patch will slow down I/O instead of making it faster because all_zero() examines all data before it is sent.

Bart.