On Tue, Mar 8, 2016 at 5:36 PM, Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote: > Hi Li, > > On Tue, 2016-03-08 at 11:55 +0800, Li Zhang wrote: > >> From: Li Zhang <zhlcindy@xxxxxxxxxxxxxxxxxx> >> >> 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% Oh, sorry. It seems that I made a mistake. > > So you would say: > > For 4GB of memory, boot time is improved by 59%, from 24.5s to 10s. Got it. :) > >> 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@xxxxxxxxxxxxxxxxxxx> >> Signed-off-by: Li Zhang <zhlcindy@xxxxxxxxxxxxxxxxxx> >> --- >> * 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@xxxxxxxxxxxxxx> > > cheers > -- Best Regards -Li -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>