From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Mon, 28 Apr 2014 16:43:19 +0000 (+0200)
Subject: drbd: don't let application IO pre-empt resync too often
X-Git-Tag: omap-for-v3.17/soc-cleanup~42^2~7^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e82998743385ca861b9ec919eb2ba8177ce72180;p=pandora-kernel.git

drbd: don't let application IO pre-empt resync too often

Before, application IO could pre-empt resync activity
for up to hardcoded 20 seconds per resync request.
A very busy server could throttle the effective resync bandwidth
down to one request per 20 seconds.

Now, we only let application IO pre-empt resync traffic
while the current resync rate estimate is above c-min-rate.

If you disable the c-min-rate throttle feature (set c-min-rate = 0),
application IO will no longer pre-empt resync traffic at all.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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