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From: Richard Weinberger <richard@nod.at>
To: dedekind1@gmail.com
Cc: nyoushchenko@mvista.com, artem.bityutskiy@linux.intel.com,
	linux-kernel@vger.kernel.org, adrian.hunter@intel.com,
	Heinz.Egger@linutronix.de, thomas.wucher@linutronix.de,
	linux-mtd@lists.infradead.org, shmulik.ladkani@gmail.com,
	tglx@linutronix.de, Marius.Mazarel@ugal.ro, tim.bird@am.sony.com
Subject: Re: UBI fastmap updates
Date: Tue, 07 Aug 2012 09:29:46 +0200	[thread overview]
Message-ID: <5020C3EA.7010009@nod.at> (raw)
In-Reply-To: <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?
> 
> With double space one can make it power-cut tolerant, because you should
> 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 >= 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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WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard@nod.at>
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
Date: Tue, 07 Aug 2012 09:29:46 +0200	[thread overview]
Message-ID: <5020C3EA.7010009@nod.at> (raw)
In-Reply-To: <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?
> 
> With double space one can make it power-cut tolerant, because you should
> 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 >= 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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  reply	other threads:[~2012-08-07  7:30 UTC|newest]

Thread overview: 122+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-09 12:18 UBI fastmap updates Richard Weinberger
2012-07-09 12:18 ` Richard Weinberger
2012-07-09 12:18 ` [PATCH 1/7] UBI: Fastmap: Fix lock imbalance in case of an error Richard Weinberger
2012-07-09 12:18   ` Richard Weinberger
2012-07-09 12:18 ` [PATCH 2/7] UBI: Fastmap: Get rid of find_fastmap switch Richard Weinberger
2012-07-09 12:18   ` Richard Weinberger
2012-07-09 12:18 ` [PATCH 3/7] UBI: Fastmap: Fix memory leak in error path Richard Weinberger
2012-07-09 12:18   ` Richard Weinberger
2012-07-09 12:18 ` [PATCH 4/7] UBI: Fastmap: Fix double free " Richard Weinberger
2012-07-09 12:18   ` Richard Weinberger
2012-07-09 12:18 ` [PATCH 5/7] UBI: Fastmap: Kerneldoc fixes Richard Weinberger
2012-07-09 12:18   ` Richard Weinberger
2012-07-09 12:18 ` [PATCH 6/7] UBI: Fastmap: Make sure that find_wl_entry() never returns NULL Richard Weinberger
2012-07-09 12:18   ` Richard Weinberger
2012-07-09 12:18 ` [PATCH 7/7] UBI: Fastmap: Make checkpatch.pl happy Richard Weinberger
2012-07-09 12:18   ` Richard Weinberger
2012-08-02 14:12 ` UBI fastmap updates Artem Bityutskiy
2012-08-02 14:12   ` Artem Bityutskiy
2012-08-02 14:15   ` Richard Weinberger
2012-08-02 14:15     ` Richard Weinberger
2012-08-02 14:29     ` Artem Bityutskiy
2012-08-02 14:29       ` Artem Bityutskiy
2012-08-02 14:51       ` Richard Weinberger
2012-08-02 14:51         ` Richard Weinberger
2012-08-02 16:17         ` Artem Bityutskiy
2012-08-02 16:17           ` Artem Bityutskiy
2012-08-02 16:32           ` Richard Weinberger
2012-08-02 16:32             ` Richard Weinberger
2012-08-02 16:45             ` Artem Bityutskiy
2012-08-02 16:45               ` Artem Bityutskiy
2012-08-02 16:54               ` Richard Weinberger
2012-08-02 16:54                 ` Richard Weinberger
2012-08-02 17:03               ` Tim Bird
2012-08-02 17:03                 ` Tim Bird
2012-08-02 17:06                 ` Richard Weinberger
2012-08-02 17:06                   ` Richard Weinberger
2012-08-02 17:40                 ` Artem Bityutskiy
2012-08-02 17:40                   ` Artem Bityutskiy
2012-08-02 17:45                   ` Richard Weinberger
2012-08-02 17:45                     ` Richard Weinberger
2012-08-02 17:59                     ` Artem Bityutskiy
2012-08-02 17:59                       ` Artem Bityutskiy
2012-08-02 18:03                       ` Richard Weinberger
2012-08-02 18:03                         ` Richard Weinberger
2012-08-02 18:15                         ` Artem Bityutskiy
2012-08-02 18:15                           ` Artem Bityutskiy
2012-08-05  8:23                     ` Shmulik Ladkani
2012-08-05  8:23                       ` Shmulik Ladkani
2012-08-05 14:25                       ` Richard Weinberger
2012-08-05 14:25                         ` Richard Weinberger
2012-08-02 17:50                 ` Artem Bityutskiy
2012-08-02 17:50                   ` Artem Bityutskiy
2012-08-02 14:58 ` Artem Bityutskiy
2012-08-02 14:58   ` Artem Bityutskiy
2012-08-02 14:59   ` Richard Weinberger
2012-08-02 14:59     ` Richard Weinberger
2012-08-02 15:18     ` Artem Bityutskiy
2012-08-02 15:18       ` Artem Bityutskiy
2012-08-02 15:19       ` Richard Weinberger
2012-08-02 15:19         ` Richard Weinberger
2012-08-06 17:36   ` Richard Weinberger
2012-08-06 17:36     ` Richard Weinberger
2012-08-07  4:21     ` Artem Bityutskiy
2012-08-07  4:21       ` Artem Bityutskiy
2012-08-07  7:29       ` Richard Weinberger [this message]
2012-08-07  7:29         ` Richard Weinberger
2012-08-07 18:53         ` Artem Bityutskiy
2012-08-07 18:53           ` Artem Bityutskiy
2012-08-02 18:50 ` Artem Bityutskiy
2012-08-02 18:50   ` Artem Bityutskiy
2012-08-02 18:56   ` Artem Bityutskiy
2012-08-02 18:56     ` Artem Bityutskiy
2012-08-03  8:47 ` Artem Bityutskiy
2012-08-03  8:47   ` Artem Bityutskiy
2012-08-03  8:56   ` Richard Weinberger
2012-08-03  8:56     ` Richard Weinberger
2012-08-17 13:11 ` Artem Bityutskiy
2012-08-17 13:11   ` Artem Bityutskiy
2012-08-17 13:33   ` Richard Weinberger
2012-08-17 13:33     ` Richard Weinberger
2012-08-17 13:41     ` Artem Bityutskiy
2012-08-17 13:41       ` Artem Bityutskiy
2012-08-17 13:43       ` Richard Weinberger
2012-08-17 13:43         ` Richard Weinberger
2012-08-17 14:06         ` Artem Bityutskiy
2012-08-17 14:06           ` Artem Bityutskiy
  -- strict thread matches above, loose matches on Subject: below --
2013-09-28 13:55 Richard Weinberger
2013-10-03 16:44 ` Artem Bityutskiy
2012-07-02 16:23 Richard Weinberger
2012-07-02 16:23 ` Richard Weinberger
2012-06-29 15:14 Richard Weinberger
2012-06-29 15:14 ` Richard Weinberger
2012-06-30 10:43 ` Artem Bityutskiy
2012-06-30 10:43   ` Artem Bityutskiy
2012-06-30 10:53   ` Richard Weinberger
2012-06-30 10:53     ` Richard Weinberger
2012-06-30 11:24     ` Artem Bityutskiy
2012-06-30 11:24       ` Artem Bityutskiy
2012-06-30 14:24     ` Artem Bityutskiy
2012-06-30 14:24       ` Artem Bityutskiy
2012-07-08 11:47 ` Shmulik Ladkani
2012-07-08 11:47   ` Shmulik Ladkani
2012-07-08 12:07   ` Richard Weinberger
2012-07-08 12:07     ` Richard Weinberger
2012-07-08 15:11     ` Richard Weinberger
2012-07-08 15:11       ` Richard Weinberger
2012-07-09  7:37     ` Shmulik Ladkani
2012-07-09  7:37       ` Shmulik Ladkani
2012-07-09  8:19       ` Richard Weinberger
2012-07-09  8:19         ` Richard Weinberger
2012-06-27 15:57 Richard Weinberger
2012-06-27 15:57 ` Richard Weinberger
2012-06-23 13:03 Richard Weinberger
2012-06-23 13:03 ` Richard Weinberger
2012-06-27  4:20 ` Namjae Jeon
2012-06-27  4:20   ` Namjae Jeon
2012-06-27  6:48   ` Nikita V. Youshchenko
2012-06-27  6:48     ` Nikita V. Youshchenko
2012-06-27  7:17     ` Richard Weinberger
2012-06-27  7:17       ` Richard Weinberger
2012-06-18 16:18 UBI Fastmap updates Richard Weinberger
2012-06-18 16:18 ` Richard Weinberger

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