linux-kernel - Re: UBIFS recovery taking too long

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Message-ID: <CAKocOOOT2J_+hmEsAnAJVWV7TOqgApd3Lih+3WaRob4e8Nex4Q@mail.gmail.com>
Date:	Mon, 9 Dec 2013 14:30:42 -0700
From:	Shuah Khan <shuahkhan@...il.com>
To:	David Mosberger-Tang <dmosberger@...il.com>, dedekind1@...il.com,
	adrian.hunter@...el.com
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: UBIFS recovery taking too long

Adding ubifs maintainers.

-- Shuah

On Mon, Dec 9, 2013 at 1:53 PM, David Mosberger-Tang
<dmosberger@...il.com> wrote:
> I've had no luck getting any response from the linux-mtd mailing list
> regarding the issue reported below.
> I think it is a very serious issue since it can easily render an
> embedded system unusable.
>
>   --david
>
> ---------- Forwarded message ----------
> From: David Mosberger-Tang <dmosberger@...il.com>
> Date: Thu, Nov 7, 2013 at 11:44 AM
> Subject: UBIFS recovery taking too long
> To: "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
>
>
> We recently encountered a strange issue where UBIFS recovery is
> suddenly taking a lot longer than usual (v3.7-based kernel).  In our
> case, recovery took about 30 seconds.  This caused a serious problem
> because our watchdog timer was set to 15 seconds, effectively
> rendering the devices unbootable.
>
> Does anybody know what triggers this slow recovery mode?  Also, how
> can we calculate a worst-case recovery time for a given flash
> chip-size.
>
> Thanks,
>
>   --david
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