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Date: Sat, 11 Jul 2015 08:46:47 +0200
From: Stefan Priebe <s.priebe@profihost.ag>
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To: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: slowdown after one week
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Hi,

while using a 40TB btrfs partition for VM backups. I see a massive 
slowdown after around one week.

The backup task takes usally 2-3 hours. After one week it takes 20 
hours. If i umount and remount the btrfs volume it takes 2-3 hours again.

Kernel 4.1.1

Greets,
Stefan