lkml.org 
[lkml]   [2020]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] x86/mm: use max memory block size on bare metal
On Thu, Jun 11, 2020 at 07:16:02AM -0700, Dave Hansen wrote:
> On 6/9/20 3:54 PM, Daniel Jordan wrote:
> > + /*
> > + * Use max block size to minimize overhead on bare metal, where
> > + * alignment for memory hotplug isn't a concern.
> > + */
> > + if (hypervisor_is_type(X86_HYPER_NATIVE)) {
> > + bz = MAX_BLOCK_SIZE;
> > + goto done;
> > + }
>
> What ends up being the worst case scenario? Booting a really small
> bare-metal x86 system, say with 64MB or 128MB of RAM? What's the
> overhead there?

Might not be following you, so bear with me, but we only get to this check on a
system with a physical address end of at least MEM_SIZE_FOR_LARGE_BLOCK (64G),
and this would still (ever so slightly...) reduce overhead of memory block init
at boot in that case.

\
 
 \ /
  Last update: 2020-06-11 19:00    [W:0.143 / U:0.552 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site