From: Artem Bityutskiy <dedekind1@gmail.com>
To: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Robert Schwebel <r.schwebel@pengutronix.de>,
linux-kernel@vger.kernel.org, linux-embedded@vger.kernel.org,
Arjan van de Ven <arjan@linux.intel.com>,
Tim Bird <tim.bird@am.sony.com>,
kernel@pengutronix.de
Subject: Re: New fast(?)-boot results on ARM
Date: Sat, 15 Aug 2009 09:14:48 +0300 [thread overview]
Message-ID: <4A865258.5090903@gmail.com> (raw)
In-Reply-To: <1158166a0908141304y70300ab3p899b0d4609efded9@mail.gmail.com>
On 08/14/2009 11:04 PM, Denys Vlasenko wrote:
>> [ 2.742628]< 0.016050> 0x000000360000-0x000004000000 : "root"
>> [ 3.058610]< 0.315982> UBI: attaching mtd7 to ubi0
>> [ 3.062878]< 0.004268> UBI: physical eraseblock size: 16384 bytes (16 KiB)
>> [ 3.070601]< 0.007723> UBI: logical eraseblock size: 15360 bytes
>> [ 3.070665]< 0.000064> UBI: smallest flash I/O unit: 512
>> [ 3.078564]< 0.007899> UBI: VID header offset: 512 (aligned 512)
>> [ 3.078609]< 0.000045> UBI: data offset: 1024
>> [ 5.006609]< 1.928000> UBI: attached mtd7 to ubi0
>> [ 5.013157]< 0.006548> UBI: MTD device name: "root"
>
> As others commented, ubi looks slow and you probably need to find out why.
Right. UBI is rather slow in attaching MTD devices. Everything is explained
here:
http://www.linux-mtd.infradead.org/doc/ubi.html#L_scalability
http://www.linux-mtd.infradead.org/doc/ubifs.html#L_scalability
There is not very much you can do to speed it up but implement UBI2. UBIFS
would stay intact. There were discussions about this and it does not seem
to be impossibly difficult to do UBI2. Here are few ideas:
http://www.linux-mtd.infradead.org/faq/ubi.html#L_attach_faster
--
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
next prev parent reply other threads:[~2009-08-15 6:14 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-14 17:02 New fast(?)-boot results on ARM Robert Schwebel
2009-08-14 18:19 ` Zan Lynx
2009-08-14 18:46 ` Jamie Lokier
2009-08-14 18:58 ` Robert Schwebel
2009-08-14 18:57 ` Robert Schwebel
2009-08-14 21:01 ` Linus Walleij
2009-08-14 21:15 ` Robert Schwebel
2009-08-14 21:35 ` Zan Lynx
2009-08-15 6:21 ` Artem Bityutskiy
2009-08-14 20:04 ` Denys Vlasenko
2009-08-14 20:43 ` Robert Schwebel
2009-08-15 5:59 ` Dirk Behme
2009-08-15 10:35 ` Johannes Stezenbach
2009-08-18 10:06 ` Marco Stornelli
2009-08-18 10:21 ` Robert Schwebel
2009-08-18 10:34 ` Alex Riesen
2009-08-18 10:44 ` Robert Schwebel
2009-08-18 10:48 ` Alex Riesen
2009-08-18 10:53 ` Robert Schwebel
2009-09-04 16:16 ` Wolfram Sang
2009-09-09 14:33 ` Johannes Stezenbach
2009-09-10 0:03 ` Denys Vlasenko
2009-08-17 19:15 ` Tim Bird
2009-08-17 22:35 ` new ipdelay= option for faster netboot (was Re: New fast(?)-boot results on ARM) Tim Bird
2009-08-18 1:03 ` new ipdelay= option for faster netboot David Miller
2009-08-18 1:24 ` Tim Bird
2009-08-18 1:27 ` David Miller
2009-08-18 1:40 ` Tim Bird
2009-08-18 1:56 ` David Miller
2009-08-19 11:57 ` Jamie Lokier
2009-08-18 4:56 ` Denys Vlasenko
2009-08-18 5:00 ` David Miller
2009-08-18 1:31 ` Rick Jones
2009-08-18 2:45 ` david
2009-08-18 4:56 ` Willy Tarreau
2009-08-15 6:14 ` Artem Bityutskiy [this message]
2009-08-18 14:06 ` New fast(?)-boot results on ARM Sascha Hauer
2009-08-18 15:31 ` Dirk Behme
2009-08-18 16:34 ` Marco Stornelli
2009-08-18 18:23 ` Tim Bird
2009-08-19 7:21 ` Sascha Hauer
2009-08-19 16:20 ` Dirk Behme
2009-08-20 8:57 ` Sascha Hauer
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