From: Rik van Riel <riel@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Pierre-Loup A. Griffais" <pgriffais@valvesoftware.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
sonnyrao@chromium.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: IO regression after ab8fabd46f on x86 kernels with high memory
Date: Mon, 29 Apr 2013 20:48:17 -0400 [thread overview]
Message-ID: <517F14D1.3070307@redhat.com> (raw)
In-Reply-To: <CA+55aFxcq44JsrrR5KKuT=DZQHCfOE3KHQrcD215T+deYesW2g@mail.gmail.com>
On 04/29/2013 06:03 PM, Linus Torvalds wrote:
> Seriously, you can compile yourself a 64-bit kernel and continue to
> use your 32-bit user-land. And you can complain to whatever distro you
> used that it didn't do that in the first place. But we're not going to
> bother with trying to tune PAE for some particular load. It's just not
> worth it to anybody.
I can think of one way to "tune PAE" that will help
avoid the breakage, and at the same time draw the
attention of users.
Limit the memory that a 32 bit PAE kernel uses, to
something small enough where the user will not
encounter random breakage. Maybe 8 or 12GB?
It could also print out a friendly message, to
inform the user they should upgrade to a 64 bit
kernel to enjoy the use of all of their memory.
It is a bit of a heavy stick, but I suspect that
it would clue in all of the affected users.
If you have no objection to this, I'll whip up a
patch.
next prev parent reply other threads:[~2013-04-30 0:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-26 23:44 IO regression after ab8fabd46f on x86 kernels with high memory Pierre-Loup A. Griffais
2013-04-27 1:53 ` Rik van Riel
2013-04-27 2:42 ` Johannes Weiner
2013-04-29 21:53 ` Pierre-Loup A. Griffais
2013-04-29 22:03 ` Linus Torvalds
2013-04-29 22:08 ` Pierre-Loup A. Griffais
2013-05-02 4:37 ` Sonny Rao
2013-04-30 0:48 ` Rik van Riel [this message]
2013-04-30 1:06 ` Pierre-Loup A. Griffais
2013-05-02 1:34 ` Steven Rostedt
2013-05-02 2:46 ` [PATCH] mm,x86: limit 32 bit kernel to 12GB memory Rik van Riel
2013-05-02 7:37 ` Pierre-Loup A. Griffais
2013-05-02 20:03 ` Linus Torvalds
2013-05-11 9:16 ` Yuhong Bao
2013-05-08 19:10 ` IO regression after ab8fabd46f on x86 kernels with high memory H. Peter Anvin
2013-06-03 1:17 ` Yuhong Bao
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=517F14D1.3070307@redhat.com \
--to=riel@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=hannes@cmpxchg.org \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=pgriffais@valvesoftware.com \
--cc=sonnyrao@chromium.org \
--cc=torvalds@linux-foundation.org \
/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.