From: Paul Mackerras <paulus@samba.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <andi@firstfloor.org>,
David Miller <davem@davemloft.net>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-ia64@vger.kernel.org, torvalds@linux-foundation.org
Subject: Re: larger default page sizes...
Date: Thu, 27 Mar 2008 14:00:00 +1100 [thread overview]
Message-ID: <18411.3504.486805.813472@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0803261052550.29859@schroedinger.engr.sgi.com>
Christoph Lameter writes:
> One should emphasize that this test was a kernel compile which is not
> a load that gains much from larger pages. 4k pages are mostly okay for
> loads that use large amounts of small files.
It's also worth emphasizing that 1.5% of the total time, or 21% of the
system time, is pure software overhead in the Linux kernel that has
nothing to do with the TLB or with gcc's memory access patterns.
That's the cost of handling memory in small (i.e. 4kB) chunks inside
the generic Linux VM code, rather than bigger chunks.
Paul.
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next prev parent reply other threads:[~2008-03-27 3:00 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-21 6:17 [00/14] Virtual Compound Page Support V3 Christoph Lameter
2008-03-21 6:17 ` [01/14] vcompound: Return page array on vunmap Christoph Lameter
2008-03-21 6:17 ` [02/14] vcompound: pageflags: Add PageVcompound() Christoph Lameter
2008-03-21 6:17 ` [03/14] vmallocinfo: Support display of vcompound for a virtual compound page Christoph Lameter
2008-03-21 7:55 ` Eric Dumazet
2008-03-21 17:32 ` Christoph Lameter
2008-03-21 6:17 ` [04/14] vcompound: Core piece Christoph Lameter
2008-03-22 12:10 ` KOSAKI Motohiro
2008-03-24 18:28 ` Christoph Lameter
2008-03-21 6:17 ` [05/14] vcompound: Debugging aid Christoph Lameter
2008-03-21 6:17 ` [06/14] vcompound: Virtual fallback for sparsemem Christoph Lameter
2008-03-21 6:17 ` [07/14] vcompound: bit waitqueue support Christoph Lameter
2008-03-21 6:17 ` [08/14] vcompound: Fallback for zone wait table Christoph Lameter
2008-03-21 6:17 ` [09/14] vcompound: crypto: Fallback for temporary order 2 allocation Christoph Lameter
2008-03-21 6:17 ` [10/14] vcompound: slub: Use for buffer to correlate allocation addresses Christoph Lameter
2008-03-21 6:17 ` [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86 Christoph Lameter
2008-03-21 7:25 ` David Miller, Christoph Lameter
2008-03-21 8:39 ` Ingo Molnar
2008-03-21 17:33 ` Christoph Lameter
2008-03-21 19:02 ` Ingo Molnar
2008-03-21 19:04 ` Christoph Lameter
2008-03-21 17:40 ` Christoph Lameter
2008-03-21 21:57 ` David Miller, Christoph Lameter
2008-03-24 18:27 ` Christoph Lameter
2008-03-24 20:37 ` larger default page sizes David Miller, Christoph Lameter
2008-03-24 21:05 ` Christoph Lameter
2008-03-24 21:43 ` David Miller, Christoph Lameter
2008-03-25 17:48 ` Christoph Lameter
2008-03-25 23:22 ` David Miller, Christoph Lameter
2008-03-25 23:41 ` Peter Chubb
2008-03-25 23:49 ` David Miller, Peter Chubb
2008-03-26 0:25 ` Peter Chubb
2008-03-26 0:31 ` David Miller, Peter Chubb
2008-03-26 0:34 ` David Mosberger-Tang
2008-03-26 0:39 ` David Miller, David Mosberger-Tang
2008-03-26 0:57 ` Peter Chubb
2008-03-26 4:16 ` John Marvin
2008-03-26 4:36 ` David Miller, John Marvin
2008-03-24 21:25 ` Luck, Tony
2008-03-24 21:46 ` David Miller, Luck, Tony
2008-03-25 3:29 ` Paul Mackerras
2008-03-25 4:15 ` David Miller, Paul Mackerras
2008-03-25 11:50 ` Paul Mackerras
2008-03-25 23:32 ` David Miller, Paul Mackerras
2008-03-25 23:49 ` Luck, Tony
2008-03-26 0:16 ` David Miller, Luck, Tony
2008-03-26 15:54 ` Nish Aravamudan
2008-03-26 17:05 ` Luck, Tony
2008-03-26 18:54 ` Mel Gorman
2008-03-25 12:05 ` Andi Kleen
2008-03-25 21:27 ` Paul Mackerras
2008-03-26 5:24 ` Paul Mackerras
2008-03-26 15:59 ` Linus Torvalds
2008-03-27 1:08 ` Paul Mackerras
2008-03-26 17:56 ` Christoph Lameter
2008-03-26 23:21 ` David Miller, Christoph Lameter
2008-03-27 3:00 ` Paul Mackerras [this message]
2008-03-25 18:27 ` Dave Hansen
2008-03-24 21:13 ` [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86 Luck, Tony
2008-03-25 17:42 ` Christoph Lameter
2008-03-25 19:09 ` Luck, Tony
2008-03-25 19:25 ` Christoph Lameter
2008-03-21 22:30 ` Andi Kleen
2008-03-24 19:53 ` Christoph Lameter
2008-03-25 7:51 ` Andi Kleen
2008-03-25 17:55 ` Christoph Lameter
2008-03-25 18:07 ` Andi Kleen
2008-03-21 6:17 ` [12/14] vcompound: Avoid vmalloc in e1000 driver Christoph Lameter
2008-03-21 17:27 ` Kok, Auke
2008-03-21 6:17 ` [13/14] vcompound: Use vcompound for swap_map Christoph Lameter
2008-03-21 21:25 ` Andi Kleen
2008-03-21 21:33 ` Christoph Lameter
2008-03-24 19:54 ` Christoph Lameter
2008-03-25 7:52 ` Andi Kleen
2008-03-25 17:45 ` Christoph Lameter
2008-03-25 17:55 ` Andi Kleen
2008-03-25 17:51 ` Christoph Lameter
2008-03-21 6:17 ` [14/14] vcompound: Avoid vmalloc for ehash_locks Christoph Lameter
2008-03-21 7:02 ` Eric Dumazet
2008-03-21 7:03 ` Christoph Lameter
2008-03-21 7:31 ` David Miller, Christoph Lameter
2008-03-21 7:42 ` Eric Dumazet
2008-03-21 7:31 ` David Miller, Eric Dumazet
2008-03-21 17:31 ` Christoph Lameter
2008-03-22 18:40 ` [00/14] Virtual Compound Page Support V3 Arjan van de Ven
2008-03-24 18:31 ` Christoph Lameter
2008-03-24 19:29 ` Christoph Lameter
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