lkml.org 
[lkml]   [2005]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: x86-64: Kernel with large page size
From
Date
Subrahmanyam Ongole <songole@gmail.com> writes:

> When we run our application on AMD Opteron processors, we are seeing a
> large number of L1_AND_L2_DTLB_MISSES. We used oprofile to measure
> these numbers.
>
> We wanted to try with a bigger page size and see if we could bring it
> down. TLB caches 4k page translations. I don't know if larger page

You can use large pages in your application by mmaping
from a file in hugetlbfs and configuring large pages using sysctl.

> size would even help here.

It probably wouldn't because Opteron has much more 4K DTLB entries
than 2M DTLB entries. I have had people trying the opposite from
what you tried (using 4K pages for the kernel instead of 2MB),
but that also doesn't work right now.

-Andi

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-06-11 12:02    [W:0.036 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site