From mboxrd@z Thu Jan 1 00:00:00 1970 To: =?euc-kr?q?JACK=20HWAN?= Cc: linuxppc-embedded@lists.linuxppc.org Subject: Re: Booting time From: Wolfgang Denk Mime-version: 1.0 Content-type: text/plain; charset=ISO-8859-1 In-reply-to: Your message of "Mon, 09 Feb 2004 10:39:45 +0900." <20040209013945.68409.qmail@web21506.mail.yahoo.com> Date: Mon, 09 Feb 2004 14:44:42 +0100 Message-Id: <20040209134447.7F1E2C108D@atlas.denx.de> Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Hello, in message <20040209013945.68409.qmail@web21506.mail.yahoo.com> you wrote: > > I ported linux-2.4.x to my motorola ppc8xx custom > board. And it works quite > well. > But the problem is booting time. It cosume too much > time than other embedded > OSes. > I disabled all options that I can. But it still slow. > I took about 15~16 sec. the others are only takes > about 8 sec. > How can I reduce the booting time? Please provide a bit more information about your hardware (which processor - a MPC850 with it's tiny caches will be slower than a MPC860P with the bigger ones; which CPU and bus clock frequencies; which memory bus width - 32 bit?). Then define how you measure "boot time" - where does it begin (at power on? when your boot loader starts loading the kernel? when control is passed to the uncompressed Linux kernel?) and where does it end (when the init process gets started? when the first user application starts running? when you entered run level 3 in a classical SysV init style system?). For a "standard" system with 50 MHz CPU and 50 MHz bus clock I can demonstrate that it takes not more than 3...4 seconds from power on until the first application process is running. Best regards, Wolfgang Denk -- See us @ Embedded World, Nuremberg, Feb 17 - 19, Hall 12.0 Booth 440 Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de It is dangerous to be right on a subject on which the established authorities are wrong. -- Voltaire ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/