Messages in this thread | | | Subject | Re: [PATCH 2/2] powerpc/mm: Enable page parallel initialisation | From | Michael Ellerman <> | Date | Tue, 08 Mar 2016 20:36:34 +1100 |
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Hi Li,
On Tue, 2016-03-08 at 11:55 +0800, Li Zhang wrote:
> From: Li Zhang <zhlcindy@linux.vnet.ibm.com> > > Parallel initialisation has been enabled for X86, boot time is > improved greatly. On Power8, it is improved greatly for small > memory. Here is the result from my test on Power8 platform: > > For 4GB memory: 57% is improved, boot time as the following: > with patch: 10s, without patch: 24.5s
This isn't worded quite right, and the numbers are a bit off.
old = 24.5 new = 10
So the improvement is 14.5 (seconds).
That means the improvement (14.5) as a percentage of the original boot time is:
= 14.5 / 24.5 * 100 = 59.183673469387756 = 59%
So you would say:
For 4GB of memory, boot time is improved by 59%, from 24.5s to 10s.
> For 50GB memory: 22% is improved, boot time as the following: > with patch: 43.8s, without patch: 56.8s
For 50GB memory, boot time is improved by 22%, from 56.8s to 43.8s.
> Acked-by: Mel Gorman <mgorman@techsingularity.net> > Signed-off-by: Li Zhang <zhlcindy@linux.vnet.ibm.com> > --- > * Add boot time details in change log. > * Please apply this patch after [PATCH 1/2] mm: meminit: initialise > more memory for inode/dentry hash tables in early boot, because > [PATCH 1/2] is to fix a bug which can be reproduced on Power.
Given that, I think it would be best if Andrew merged both of these patches. Because this patch is pretty trivial, whereas the patch to mm/ is less so.
Is that OK Andrew?
For this one:
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
cheers
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