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SubjectRe: [RFC 2/2] x86_64, mm: Reinsert the absent memory
On 06/25/2013 10:22 AM, Mike Travis wrote:
>
> On 6/25/2013 12:38 AM, Ingo Molnar wrote:
>>
>> * Nathan Zimmer <nzimmer@sgi.com> wrote:
>>
>>> On Sun, Jun 23, 2013 at 11:28:40AM +0200, Ingo Molnar wrote:
>>>>
>>>> That's 4.5 GB/sec initialization speed - that feels a bit slow and the
>>>> boot time effect should be felt on smaller 'a couple of gigabytes'
>>>> desktop boxes as well. Do we know exactly where the 2 hours of boot
>>>> time on a 32 TB system is spent?
>>>
>>> There are other several spots that could be improved on a large system
>>> but memory initialization is by far the biggest.
>>
>> My feeling is that deferred/on-demand initialization triggered from the
>> buddy allocator is the better long term solution.
>
> I haven't caught up with all of Nathan's changes yet (just
> got back from vacation), but there was an option to either
> start the memory insertion on boot, or trigger it later
> using the /sys/.../memory interface. There is also a monitor
> program that calculates the memory insertion rate. This was
> extremely useful to determine how changes in the kernel
> affected the rate.
>

Sorry, I *totally* did not follow that comment. It seemed like a
complete non-sequitur?

-hpa




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