On 11/26/2009 10:53 AM, Marco Crosio wrote:
Hi people, i have just installed fedora 12 on my acer Aspire 6930, and everything go fine... (overwriting a perfectly running Fedora11 :) ) but when i reboot the machine it taken very long times to complete the boot procedure...
Some motherboards are still having problems generating enough entropy during the boot process.
Without bootchart running, try simply running a thumb or finger over the mouse pad, occasionally, during boot. User input is always good entropy and the kernel will use it if it needs more.
You can watch the disk activity light. If it stops, swipe the mouse pad. If it starts right up again, then this is your issue.
On one test machine here, the boot process can take over 5 minutes! If the mousepad is used during the boot process, the time to boot drops to 15 seconds.
This is a clear issue of a lack of usable entropy on this system. The normal places that the kernel looks for entropy are not used heavily on every type of motherboard. Its a real challenge, because the kernel MUST load some things in random locations in order to maintain any type of security. If it cannot get enough entropy to generate a good random number, it sits and waits until it can.
In the old days, the kernel did not care about this as much as it needs to now. An older kernel might boot fast, but it may not be as secure.
With the 2.6.30 kernels, this seems to be a bigger issue than it was before, and seems to affect more mother boards.
If the mouse trick works for you, be sure to enter a bug with your smolt data so that the kernel guys can help the future kernels find the entropy it needs on your system type.
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