On Thu, Mar 25, 2004 at 12:44:30PM +0100, Markus Bernauer wrote: > I was following the discussion about the performance of different > IBM440GX/GP systems with increasing interest. > We are going to use an IBM400GP in conjunction with the Ebony-Evalboard > for a project that demands boot times as short as possible. Could you > please give me any hints about how fast your systems boot and whether > you optimized the systems to reach these bootup times.
Well, I cannot say I spent any time optimizing boot times :). My estimation is 1-2s for bootloader, 2-3s for Linux kernel, provided you kernel is in the flash memory, and doesn't have a lot of hw to detect (like SCSI disks). Also note that time I gave to the kernel doesn't include startup scripts (everything started by init). Usually init processing takes a lot of time, so using something like busybox helps a lot. One thing, to achieve such boot speeds _disable_ serial system console. My estimations are based on 405GPr-based hw boot times. > I know that there are several possibilites to reduce boot time of linux, > but at the moment it would suffice to have some values for orientation. > I also know that there are differences in boot time dependent on > hardware and software configuration so it would be nice to get > at least little information about the systems the different boot times > belong to. > The other, less preferable possibility to achieve fast bootup, would be > to use SCIOPTA. But I am afraid this would be off topic, isn?t it?;-) Hmm, I have no idea what SCIOPTA is :). Eugene ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
