Re: [RFC v3 0/5] Transparent on-demand struct page initializationembedded in the buddy allocator

[Mike Travis]

On 8/13/2013 11:04 AM, Mike Travis wrote:
> 
> 
> On 8/13/2013 10:51 AM, Linus Torvalds wrote:
>> by the time you can log in. And if it then takes another ten minutes
>> until you have the full 16TB initialized, and some things might be a
>> tad slower early on, does anybody really care?  The machine will be up
>> and running with plenty of memory, even if it may not be *all* the
>> memory yet.
> 
> Before the patches adding memory took ~45 mins for 16TB and almost 2 hours
> for 32TB.  Adding it late sped up early boot but late insertion was still
> very slow, where the full 32TB was still not fully inserted after an hour.
> Doing it in parallel along with the memory hotplug lock per node, we got
> it down to the 10-15 minute range.
> 

FYI, the system at this time had 128 nodes each with 256GB of memory.
About 252GB was inserted into the absent list from nodes 1 .. 126.
Memory on nodes 0 and 128 was left fully present.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/