From: "Stephen C. Tweedie" <sct@redhat.com>
To: Venkatesh Ramamurthy <Venkateshr@ami.com>
Cc: "'Pavel Machek'" <pavel@suse.cz>,
adefacc@tin.it, linux-kernel@vger.kernel.org,
Stephen Tweedie <sct@redhat.com>
Subject: Re: Confirmation request about new 2.4.x. kernel limits
Date: Tue, 9 Jan 2001 14:05:04 +0000 [thread overview]
Message-ID: <20010109140504.D4284@redhat.com> (raw)
In-Reply-To: <1355693A51C0D211B55A00105ACCFE64E95137@ATL_MS1>
In-Reply-To: <1355693A51C0D211B55A00105ACCFE64E95137@ATL_MS1>; from Venkateshr@ami.com on Mon, Jan 08, 2001 at 11:11:05PM -0500
Hi,
On Mon, Jan 08, 2001 at 11:11:05PM -0500, Venkatesh Ramamurthy wrote:
>
> > Max. RAM size: 64 GB (any slowness
> accessing RAM over 4 GB
> * with 32 bit machines ?)
> Imore than 4GB in RAM is bounce buffered, so there is performance
> penalty as the data have to be copied into the 4GB RAM area
Any memory over 1GB is bounce-buffered, but we don't use that memory
for anything other than process data pages or file cache, so only
swapping and disk IO to regular files gets the extra copy. In
particular, things like network buffers are still all kept in the low
1GB so never need to be buffered.
--Stephen
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next prev parent reply other threads:[~2001-01-09 14:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-09 4:11 Confirmation request about new 2.4.x. kernel limits Venkatesh Ramamurthy
2001-01-09 12:21 ` Matti Aarnio
2001-01-09 16:27 ` Tim Wright
2001-01-09 16:44 ` Andi Kleen
2001-01-09 16:50 ` Tim Wright
2001-01-10 13:16 ` Kurt Garloff
2001-01-09 14:05 ` Stephen C. Tweedie [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-01-09 18:00 Venkatesh Ramamurthy
2001-01-09 17:35 Venkatesh Ramamurthy
2001-01-09 17:47 ` Andi Kleen
2001-01-09 15:15 Venkatesh Ramamurthy
2001-01-09 15:51 ` Andi Kleen
2001-01-04 11:50 A.D.F.
2001-01-04 11:23 ` Tigran Aivazian
2001-01-04 11:50 ` Anton Blanchard
2001-01-05 22:46 ` Pavel Machek
2001-01-09 14:03 ` Stephen C. Tweedie
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