Message-ID: <5020C3EA.7010009@nod.at>
Date: Tue, 07 Aug 2012 09:29:46 +0200
From: Richard Weinberger <richard@nod.at>
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To: dedekind1@gmail.com
CC: artem.bityutskiy@linux.intel.com, linux-mtd@lists.infradead.org,
        linux-kernel@vger.kernel.org, adrian.hunter@intel.com,
        Heinz.Egger@linutronix.de, thomas.wucher@linutronix.de,
        shmulik.ladkani@gmail.com, tglx@linutronix.de, tim.bird@am.sony.com,
        Marius.Mazarel@ugal.ro, nyoushchenko@mvista.com
Subject: Re: UBI fastmap updates
References: <1341836323-43916-1-git-send-email-richard@nod.at>  <1343919530.25013.116.camel@sauron.fi.intel.com> <50200096.1070002@nod.at> <1344313269.1865.2.camel@kyv>
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Am 07.08.2012 06:21, schrieb Artem Bityutskiy:
> On Mon, 2012-08-06 at 19:36 +0200, Richard Weinberger wrote:
>> I think we enable fastmap only if a MTD device has more than
>> UBI_FM_MAX_START*2 PEBs.
>> Any comments?
>=20
> With double space one can make it power-cut tolerant, because you shoul=
d
> be able to have either old or new fastmap at any point of time.

UBI_FM_MAX_START*2 has nothing do to with the Fastmap size.
IMHO we need a threshold where Fastmap makes sense.
Technically Fastmap can only be used if a MTD device has >=3D UBI_FM_MAX_=
START
PEBs.
But does this makes sense? Fastmap was invented to speedup attaching on *=
large* MTDs,
The benefit in small MTDs is very little.

Thanks,
//richard


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