[lkml]   [2012]   [Nov]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRE: [PATCH v2 0/5] Add movablecore_map boot option
Disk I/O is still a big consumer of lowmem.

"Luck, Tony" <> wrote:

>> If any significant percentage of memory is in ZONE_MOVABLE then the
>> hotplug people will have to deal with all the lowmem/highmem problems
>> that used to be faced by 32-bit x86 with PAE enabled.
>While these problems may still exist on large systems - I think it
>harder to construct workloads that run into problems. In those bad old
>a significant fraction of lowmem was consumed by the kernel ... so it
>pretty easy to find meta-data intensive workloads that would push it
>a cliff. Here we are talking about systems with say 128GB per node
>into 64GB moveable and 64GB non-moveable (and I'd regard this as a
>low-end machine). Unless the workload consists of zillions of tiny
>all mapping shared memory blocks, the percentage of memory allocated to
>the kernel is going to be tiny compared with the old 4GB days.

Sent from my mobile phone. Please excuse brevity and lack of formatting.

 \ /
  Last update: 2012-11-30 04:41    [W:0.091 / U:0.656 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site