From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "William J. Earl" <wje@cthulhu.engr.sgi.com>
Cc: alan@lxorguk.ukuu.org.uk, mingo@chiara.csoma.elte.hu,
jgarzik@mandrakesoft.com, linux-kernel@vger.rutgers.edu,
linux-mm@kvack.org
Subject: Re: Getting big areas of memory, in 2.3.x?
Date: Fri, 10 Dec 1999 00:37:55 +0000 (GMT) [thread overview]
Message-ID: <E11wE4L-0002rc-00@the-village.bc.nu> (raw)
In-Reply-To: <14416.18872.811910.38578@liveoak.engr.sgi.com> from "William J. Earl" at Dec 9, 99 04:30:48 pm
> Then too, there is the matter of TLB misses for applications which
> visit a lot of data, especially on processors with reasonably large
> caches. With 4 KB pages and 64 TLB entries, the TLB cannot map all of
> a cache larger than 256 KB. If the cache is, say, 2 MB and the
> application cycles through many of the pages in the cache in a loop,
> you can wind up with a TLB miss for almost every load (other than those from
> the stack). With 1 MB pages, there are almost no TLB misses.
With very large amounts of memory I don't doubt this. X86 is alas crippled
with a choice of 4K, 2Mb or 4Mb pages.
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next prev parent reply other threads:[~1999-12-10 0:37 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-12-09 1:03 Jeff Garzik
1999-12-09 2:28 ` Alan Cox
1999-12-09 2:45 ` Jeff Garzik
1999-12-09 5:22 ` Oliver Xymoron
1999-12-09 12:25 ` Ingo Molnar
1999-12-09 20:24 ` Jeff Garzik
1999-12-09 20:31 ` Kanoj Sarcar
1999-12-09 20:39 ` Rik van Riel
1999-12-09 20:54 ` Kanoj Sarcar
1999-12-09 23:21 ` Ingo Molnar
1999-12-09 22:27 ` Kanoj Sarcar
1999-12-09 23:16 ` Ingo Molnar
1999-12-09 23:09 ` Benjamin C.R. LaHaise
1999-12-10 0:44 ` Ingo Molnar
1999-12-10 0:18 ` William J. Earl
1999-12-11 19:56 ` Stephen C. Tweedie
1999-12-10 12:21 ` Rik van Riel
1999-12-10 13:42 ` Ingo Molnar
1999-12-10 18:04 ` William J. Earl
1999-12-09 20:50 ` William J. Earl
1999-12-09 23:15 ` Ingo Molnar
1999-12-09 22:13 ` William J. Earl
1999-12-09 22:26 ` Alan Cox
1999-12-09 23:42 ` William J. Earl
1999-12-09 23:50 ` Alan Cox
1999-12-10 0:30 ` William J. Earl
1999-12-10 0:37 ` Alan Cox [this message]
1999-12-10 4:19 ` Oliver Xymoron
1999-12-10 10:14 ` Thomas Sailer
1999-12-09 23:24 ` Ingo Molnar
1999-12-09 22:33 ` Jeff Garzik
1999-12-09 23:32 ` Rogier Wolff
1999-12-09 23:44 ` JF Martinez
1999-12-10 0:52 ` Ingo Molnar
1999-12-09 23:46 ` Andi Kleen
1999-12-10 13:52 ` Stephen C. Tweedie
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