lkml.org 
[lkml]   [2015]   [Sep]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Fwd: [PATCH] x86: Use larger chunks in mtrr_cleanup


On 09/02/2015 10:45 PM, Luis R. Rodriguez wrote:
> On Mon, Aug 31, 2015 at 11:05:33AM -0500, Stuart Hayes wrote:
>> Increase the range of chunk sizes tried in mtrr_cleanup() so it is able
>> to map large memory configs into MTRRs.
>>
>> Currently, mtrr_cleanup() will fail with large memory configurations,
>> because it limits chunk_size to 2GB, which means that each MTRR can only
>> cover 2GB of memory. With a memory size of, say, 256GB, and ten variable
>> MTRRs (such as some recent Intel CPUs have), it is not possible to set up
>> the MTRRs to cover all of memory.
>
> Linux drivers no longer use MTRR so why is the cleanup needed, ie, what would
> happen if the cleanup is just skipped in your case ?

The infiniband & video drivers still use MTRR (or at least it was my
understanding that they do). In any case, Stuart -- could you try booting with
'disable_mtrr_cleanup' as a kernel parameter?

P.


\
 
 \ /
  Last update: 2015-09-03 14:41    [W:0.084 / U:0.836 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site