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Message-ID: <1443082418.19983.238.camel@gmail.com> Date: Thu, 24 Sep 2015 11:13:38 +0300 From: Artem Bityutskiy <dedekind1@...il.com> To: Theodore Ts'o <tytso@....edu> Cc: Chris Mason <clm@...com>, linux-ext4@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>, axboe@...nel.dk, Tejun Heo <tj@...nel.org>, linux-fsdevel@...r.kernel.org, lizefan@...wei.com, cgroups@...r.kernel.org, adilger.kernel@...ger.ca, kernel-team@...com, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 2/2] ext4: implement cgroup writeback support On Wed, 2015-09-23 at 16:48 -0400, Theodore Ts'o wrote: > On Wed, Sep 23, 2015 at 10:47:16PM +0300, Artem Bityutskiy wrote: > > And, by the way, I forgot this detail - I cut AC power off at the > > end, then put it back on after a 20 seconds delay. I mean, this is > > a > > clean reboot, but with power cut at the end. > > Is this reproducible without the power cut? And what model SSD are > you using, and are you sure that it has Power Loss Protection (many > SSD vendors use power loss protection as the price discrimination > feature between consumer-grade SSD and enterprise-grade SSD's that > cost $$$). If this problem wasn't showing up with 4.2, and is only > failing with 4.3-rcX, then it might not be a hardware issue --- but > it's also possible that there was a timing issue which was hiding a > hardware problem. So for the purposes of debugging, removing the > power cut from the set of variables is a useful thing to do. Ted, you are right that the problem may be anywhere, but since Tejun's patch fixes it, I decided to not spend time on testing without AC power cuts. But I checked and on of my boxes uses an HDD, and it shows the same problem, which makes the theory of imperfect SSD firmware being involved less likely. Thanks, Artem. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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