[Skiboot] [RFC v2 PATCH 0/6] Faster fast reboot (2x!)

Stewart Smith stewart at linux.ibm.com
Tue Jul 17 14:50:25 AEST 2018

Nicholas Piggin <npiggin at gmail.com> writes:
> On Thu, 28 Jun 2018 12:54:55 +1000
> Stewart Smith <stewart at linux.ibm.com> wrote:
>> Currently, on a 128GB p9dsu system (with all that memory on node0), it
>> takes around 13 seconds in skiboot to do a fast reboot.
>> By doing the clear in parallel, we get this down to ~11seconds.
>> By then doing it in parallel with PCI scanning, we're down to ~9
>> seconds.
>> By then caching BOOTKERNEL rather than re-reading it, we're down to
>> ~5seconds.
> Very nice result! All the patches and rationales seem reasonable to me.
> I can take another look at my patch and write a proper changelog for it
> if you want to merge it. Did you have to make any changes?

I think it all looks good now. I'm a bit umming and ahhing over if I
want to pull in the pnor caching code now or modify it a bit to do some
sanity checks before using the cache. I think I'll leave it for the time
being though, force myself to do it correctly :)

Stewart Smith
OPAL Architect, IBM.

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