Messages in this thread | | | Date | Sat, 16 May 2015 04:46:17 -0400 | Subject | Re: [PATCH] x86: skip delays during SMP initialization similar to Xen | From | Len Brown <> |
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On Thu, May 14, 2015 at 2:44 AM, Ingo Molnar <mingo@kernel.org> wrote:
> >> BTW. this time can be reduced by 7% (113 ms) by deleting >> announce_cpu(): >> >> [ 1.445815] x86: Booted up 4 nodes, 120 CPUs > > so that kind of info looks pretty useful, especially when there's > hangs/failures.
I think the messages we print on failure are useful. I think the success case should be a 1-line summary.
> I'm wondering what takes 113 msecs to print 120 CPUs - > that's about 1 msec per a few chars of printk produced, seems > excessive. Do you have any idea what's going on there? Does your > system print to a serial console perhaps?
Yes, serial console -- that server is actually much closer to you than it is to me, it is in Finland:-)
I should benchmark it, because 115200 should be faster...
cheers, Len Brown, Intel Open Source Technology Center
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