From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [195.209.228.254] (helo=shelob.oktetlabs.ru) by canuck.infradead.org with esmtps (Exim 4.52 #1 (Red Hat Linux)) id 1EINjI-0001Uw-Jf for linux-mtd@lists.infradead.org; Thu, 22 Sep 2005 05:51:12 -0400 Message-ID: <43327E5E.5090701@yandex.ru> Date: Thu, 22 Sep 2005 13:50:22 +0400 From: "Artem B. Bityutskiy" MIME-Version: 1.0 To: Ferenc Havasi References: <20050921211326.GK8421@lunn.ch> <43324D42.5060407@yandex.ru> <20050922064104.GM8421@lunn.ch> <43325439.1060307@yandex.ru> <43327C07.6020506@inf.u-szeged.hu> In-Reply-To: <43327C07.6020506@inf.u-szeged.hu> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: Andrew Lunn , Linux MTD Subject: Re: Another compiler error: sumtool.c List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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.