From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lazybastard.de ([212.112.238.170] helo=longford.logfs.org) by bombadil.infradead.org with esmtps (Exim 4.68 #1 (Red Hat Linux)) id 1K4MiH-0003MN-T1 for linux-mtd@lists.infradead.org; Thu, 05 Jun 2008 21:09:38 +0000 Date: Thu, 5 Jun 2008 23:09:29 +0200 From: =?utf-8?B?SsO2cm4=?= Engel To: Alexey Korolev Subject: Re: [RFC/PATCH 2/3] NAND multiple plane feature Message-ID: <20080605210929.GB19234@logfs.org> References: <20080601174841.GH13094@logfs.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Cc: dwmw2@infradead.org, tglx@linutronix.de, linux-mtd@lists.infradead.org, vasiliy.leonenko@gmail.com List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, 3 June 2008 17:57:35 +0100, Alexey Korolev wrote: > > We did some performance testing for this feature: we did not find a test > case where JFFS2 on NAND with dual-plane has lower performance than > JFFS2 on NAND without dual-plane features. (note: subpage read feature > was enabled for both cases) Maybe I have a testcase for you. The "evil workload". 1. Write a file until you get -ENOSPC. 2. Replace 1000 page-sized page-aligned blocks at random offsets. The time for 2 should roughly double with bigger eraseblocks. [ And yes, I originally got this testcase from you. ;) ] Jörn -- Time? What's that? Time is only worth what you do with it. -- Theo de Raadt