From: Andi Kleen <ak@muc.de>
To: Subrahmanyam Ongole <songole@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: x86-64: Kernel with large page size
Date: Sat, 11 Jun 2005 11:58:39 +0200 [thread overview]
Message-ID: <m164wldxkg.fsf@muc.de> (raw)
In-Reply-To: <a8447f24050603175061598809@mail.gmail.com> (Subrahmanyam Ongole's message of "Fri, 3 Jun 2005 17:50:55 -0700")
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
prev parent reply other threads:[~2005-06-11 9:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-04 0:50 x86-64: Kernel with large page size Subrahmanyam Ongole
2005-06-04 0:59 ` William Lee Irwin III
2005-06-04 2:28 ` Nick Piggin
2005-06-11 9:58 ` Andi Kleen [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=m164wldxkg.fsf@muc.de \
--to=ak@muc.de \
--cc=linux-kernel@vger.kernel.org \
--cc=songole@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.