From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [67.18.166.194] (helo=warp.phpwebhosting.com) by canuck.infradead.org with smtp (Exim 4.63 #1 (Red Hat Linux)) id 1HggMR-0007lt-I3 for linux-mtd@lists.infradead.org; Wed, 25 Apr 2007 08:12:42 -0400 Message-ID: <462F45B1.8020007@indefia.com> Date: Wed, 25 Apr 2007 15:12:33 +0300 From: Semih Hazar MIME-Version: 1.0 To: linux-mtd@lists.infradead.org Subject: Slow NAND + JFFS2 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi, I'm using a 256 MiB NAND Flash from ST -> Manufacturer ID: 0x20, Chip ID: 0xda (ST Micro NAND 256MiB 3,3V 8-bit) with JFFS2. The filesystem is mounted as rootfs and the size is around 60 megs. Filesystem operations seem very slow to me. Such as: It takes almost 1 and a half minutes to copy a 30 meg file. Mounting the filesystem takes around 1 minute. # ls -lh -rw-r--r-- 1 root root 30.3M Jan 1 00:05 gcc.tgz # time cp gcc.tgz 1 real 1m 22.37s user 0m 0.09s sys 1m 22.22s # This seemed really slow to me, but I don't have any other benchmarks. Can someone comment on these values ? The processor is at32ap7000 from Atmel, running at 160 MHz. I'm running kernel 2.6.20.1 with cpu related patches from Atmel and our own nand patches which are almost the replica of at91_nand.c (I can send it if you need) I also changed the read enable and write enable pulse timings according to the minimum values stated in NAND flash's datasheet. If this copy/mount time are really slow as I think, where should I check ? Is this a JFFS2 related issue or should I try to find some problems in our nand driver or ... ? Best regards, Semih Hazar