From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: "Sandeep Kumar" <sandeepksinha@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PAE and PSE ??
Date: Sun, 22 Oct 2006 12:15:26 +0200 [thread overview]
Message-ID: <200610221215.26525.rjw@sisk.pl> (raw)
In-Reply-To: <37d33d830610212329o420e0ee4i75e6bddfcf2fb772@mail.gmail.com>
Hi,
On Sunday, 22 October 2006 08:29, Sandeep Kumar wrote:
> Hi all,
> I have read in UTLK by bovet that the linux kernel does not uses the
> PSE bit on an x86
> machine. Then how come we have the hugetlbfs, which provides support
> for 4MB pages ?
AFAIK, PSE is only used when PAE is not set and then it enables the 4 MB
pages. If PAE is set, the 4 MB pages are impossible because there are only
512 entries per page table, but 2 MB pages can be used instead (and you don't
need to set PSE to use them).
Greetings,
Rafael
--
You never change things by fighting the existing reality.
R. Buckminster Fuller
next prev parent reply other threads:[~2006-10-22 10:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-22 6:29 Sandeep Kumar
2006-10-22 10:15 ` Rafael J. Wysocki [this message]
2006-10-22 23:37 ` H. Peter Anvin
2006-10-23 10:13 ` Rafael J. Wysocki
2006-10-23 14:10 ` H. Peter Anvin
2006-10-23 14:14 ` Rafael J. Wysocki
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