From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Stephen R. van den Berg" Subject: 3.18.3 + latest bcache-dev Date: Wed, 21 Jan 2015 02:24:24 +0100 Message-ID: <20150121012424.GB5533@cuci.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from aristoteles.cuci.nl ([212.125.128.18]:49414 "EHLO aristoteles.cuci.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752451AbbAUBYZ (ORCPT ); Tue, 20 Jan 2015 20:24:25 -0500 Content-Disposition: inline Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: linux-bcache@vger.kernel.org I have: 16GB RAM 16GB SSD swap 5 x 6TB HDD bcache backing storage 2 x 490GB SSD bcache cache (Crucial M550, 4KB block, 2M bucket size) writeback and trim enabled on bcache. I used the latestbcache tools from git. On the backing storage, I created a BTRFS using nossd and notrim. Now, whenever I boot, I end up with exactly 4 bcache_writebac processes pegged at 99 or 100% CPU. This is on an octocore cpu. top shows it as 50% system time. The four processes are marked as R, but I cannot trace them. Even after waiting for several minutes, the cpu load does not come down. The mounted volume simply seems to work, though. Any ideas? -- Stephen.