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From: "Artem B. Bityutskiy" <dedekind@yandex.ru>
To: Ferenc Havasi <havasi@inf.u-szeged.hu>
Cc: Andrew Lunn <andrew@lunn.ch>, Linux MTD <linux-mtd@lists.infradead.org>
Subject: Re: Another compiler error: sumtool.c
Date: Thu, 22 Sep 2005 13:50:22 +0400	[thread overview]
Message-ID: <43327E5E.5090701@yandex.ru> (raw)
In-Reply-To: <43327C07.6020506@inf.u-szeged.hu>

Dear Ferenc,

Ferenc Havasi wrote:
>>EBS makes mount really faster. But then the JFFS2 checker is working,
>>and in case of NOR+EBS it will work longer and eat more CPU. JFFS2
>>writers are blocked while the checker is working, so it may slow down
>>the boot process. That's the theory, experiments are needed.
> 
> Artem, I think you have a little bit negative attitude against
> summary/EBS. :) You are right, we should write docs for summary, and we
> will do it soon.
No, beleave me! :-) I am actually fond of it as it improves JFFS2 
scalability. I'm just being strict.

> Just for information: EBS was mainly designed for NAND, because JFFS2
> was designed for NOR, and produces very very slow mounting on big NAND
> chips. The idea is simple, and it seems to cause mount speed up at NOR,
> too. We've got many positive feedbacks. The price of the using EBS at
> NOR is to disable the obsolating method of NOR and apply the one used on
> NAND. I don't think it cause too much CPU penalty in normal usage, at
> least nobody complained of it.
May be you did not notice, I said EBS *may* be slow for *small* NOR 
flashes. This means it should be OK for large ones. How small - no idea. 
Just off the top of my head - may be 8-16 MB. I explained why I think so 
- if you don't agree - complain please :-). Don't take any offense 
please :-)

-- 
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.

      reply	other threads:[~2005-09-22  9:51 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-21 21:13 Another compiler error: sumtool.c Andrew Lunn
2005-09-22  6:20 ` Artem B. Bityutskiy
2005-09-22  6:41   ` Andrew Lunn
2005-09-22  6:50     ` Artem B. Bityutskiy
2005-09-22  9:40       ` Ferenc Havasi
2005-09-22  9:50         ` Artem B. Bityutskiy [this message]

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