From: Flash ROM <flashromguru@yandex.com>
To: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: 6+ MiB/s constant usage on a btrfs volume with kernel 3.16
Date: Sun, 24 Aug 2014 19:46:41 +0200 [thread overview]
Message-ID: <441201408902401@web23m.yandex.ru> (raw)
In-Reply-To: <CAGQ70euehc2=Q9rRJ1zk7HzobDsbBg8QnVi=-2t3Zhn35xLRzA@mail.gmail.com>
> Happens a 100% of the time here, annoyingly. As mentioned, 3.15 was
> working for me, and still does. Multiple reboots and it happens
> immediately on boot even before gdm comes up.
Would be logical to do block-level I/O tracing to get idea WHAT is this IO, right?
Try something like echo 1 > /proc/sys/vm/block_dump and see dmesg.
Beware: it can flood your logs and then dumping logs to HDD can also cause I/O ( which is in turn logged).
So take care and do not forget to disable it by doing echo 0 > /proc/sys/vm/block_dump
next prev parent reply other threads:[~2014-08-24 17:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-24 9:55 6+ MiB/s constant usage on a btrfs volume with kernel 3.16 Oon-Ee Ng
2014-08-24 12:57 ` Duncan
2014-08-24 15:58 ` Oon-Ee Ng
2014-08-24 17:46 ` Flash ROM [this message]
2014-08-24 18:08 ` Holger Hoffstätte
2014-08-25 0:05 ` Oon-Ee Ng
2014-08-25 2:09 ` Oon-Ee Ng
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