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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <571E37AD.1050607@sandisk.com>
Date:	Mon, 25 Apr 2016 08:28:45 -0700
From:	Bart Van Assche <bart.vanassche@...disk.com>
To:	Philipp Reisner <philipp.reisner@...bit.com>,
	Jens Axboe <axboe@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"drbd-dev@...ts.linbit.com" <drbd-dev@...ts.linbit.com>
Subject: Re: [Drbd-dev] [PATCH 04/30] drbd: Implement handling of thinly
 provisioned storage on resync target nodes

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.