From: Chris Wedgwood <cw@f00f.org>
To: Brian Gerst <bgerst@didntduck.org>
Cc: Jesse Pollard <pollard@tomcat.admin.navo.hpc.mil>,
ttabi@interactivesi.com, linux-kernel@vger.kernel.org
Subject: Re: What is the truth about Linux 2.4's RAM limitations?
Date: Wed, 11 Jul 2001 06:43:55 +1200 [thread overview]
Message-ID: <20010711064355.F32421@weta.f00f.org> (raw)
In-Reply-To: <200107101812.NAA01171@tomcat.admin.navo.hpc.mil> <3B4B4966.996DD91E@didntduck.org>
In-Reply-To: <3B4B4966.996DD91E@didntduck.org>
On Tue, Jul 10, 2001 at 02:28:54PM -0400, Brian Gerst wrote:
Jesse Pollard wrote:
> If the entire page table were given to a user, then a full cache
> flush would have to be done on every context switch and system
> call. That would be very slow, but would allow a full 4G address
> for the user.
A full cache flush would be needed at every entry into the kernel,
including hardware interrupts. Very poor for performance.
Why would a cache flush be necessary at all? I assume ia32 caches
where physically not virtually mapped?
--cw
next prev parent reply other threads:[~2001-07-10 18:44 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-10 18:12 What is the truth about Linux 2.4's RAM limitations? Jesse Pollard
2001-07-10 18:22 ` Jonathan Lundell
2001-07-10 18:28 ` Brian Gerst
2001-07-10 18:43 ` Chris Wedgwood [this message]
2001-07-10 19:35 ` Brian Gerst
-- strict thread matches above, loose matches on Subject: below --
2001-07-11 4:31 alad
2001-07-10 21:49 Jesse Pollard
2001-07-10 22:07 ` Jonathan Lundell
2001-07-10 18:38 Jesse Pollard
2001-07-10 19:14 ` Mark H. Wood
2001-07-09 21:29 Jesse Pollard
2001-07-10 17:01 ` Timur Tabi
[not found] <Pine.LNX.4.32.0107091250170.25061-100000@maus.spack.org.suse.lists.linux.kernel>
2001-07-09 21:03 ` Andi Kleen
2001-07-09 20:01 Adam Shand
2001-07-09 21:15 ` Brian Gerst
2001-07-09 21:18 ` Rik van Riel
2001-07-09 22:17 ` Matti Aarnio
2001-07-10 13:49 ` Chris Wedgwood
2001-07-10 17:03 ` Timur Tabi
2001-07-10 17:35 ` Richard B. Johnson
2001-07-10 18:01 ` Timur Tabi
2001-07-10 18:08 ` Jonathan Lundell
2001-07-10 18:45 ` Richard B. Johnson
2001-07-10 19:26 ` Jonathan Lundell
2001-07-10 23:56 ` Jesse Pollard
2001-07-10 20:19 ` Malcolm Beattie
2001-07-10 3:01 ` jlnance
2001-07-10 3:29 ` Michael Bacarella
2001-07-16 8:37 ` Ingo Oeser
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