From: Avi Kivity <avi@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>,
Adam Litke <agl@us.ibm.com>, Izik Eidus <ieidus@redhat.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Nick Piggin <npiggin@suse.de>, Rik van Riel <riel@redhat.com>,
Mel Gorman <mel@csn.ul.ie>, Dave Hansen <dave@linux.vnet.ibm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Mike Travis <travis@sgi.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Christoph Lameter <cl@linux-foundation.org>,
Chris Wright <chrisw@sous-sol.org>,
bpicco@redhat.com,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Arnd Bergmann <arnd@arndb.de>,
"Michael S. Tsirkin" <mst@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Subject: Re: [PATCH 00 of 41] Transparent Hugepage Support #17
Date: Tue, 06 Apr 2010 14:55:32 +0300 [thread overview]
Message-ID: <4BBB2134.9090301@redhat.com> (raw)
In-Reply-To: <4BBB052D.8040307@redhat.com>
On 04/06/2010 12:55 PM, Avi Kivity wrote:
>
> Here is a microbenchmark demonstrating the hit (non-virtualized); it
> simulates a pointer-chasing application with a varying working set.
> It is easy to see when the working set overflows the various caches,
> and later when the page tables overflow the caches. For
> virtualization the hit will be a factor of 3 instead of 2, and will
> come earlier since the page tables are bigger.
>
And here is the same thing with guest latencies as well:
Random memory read latency, in nanoseconds, according to working
set and page size.
------- host ------ ------------- guest -----------
--- hpage=4k --- -- hpage=2M -
size 4k 2M 4k/4k 2M/4k 4k/2M 2M/2M
4k 4.9 4.9 5.0 4.9 4.9 4.9
16k 4.9 4.9 5.0 4.9 5.0 4.9
64k 7.6 7.6 7.9 7.8 7.8 7.8
256k 15.1 8.1 15.9 10.3 15.4 9.0
1M 28.5 23.9 29.3 37.9 29.3 24.6
4M 31.8 25.3 37.5 42.6 35.5 26.0
16M 94.8 79.0 110.7 107.3 92.0 77.3
64M 260.9 224.2 294.2 247.8 251.5 207.2
256M 269.8 248.8 313.9 253.1 260.1 230.3
1G 278.1 246.3 331.8 273.0 269.9 236.7
4G 330.9 252.6 545.6 346.0 341.6 256.5
16G 436.3 243.8 705.2 458.3 463.9 268.8
64G 486.0 253.3 767.3 532.5 516.9 274.7
It's easy to see how cache effects dominate the tlb walk. The only way
hardware can reduce this is by increasing cache sizes dramatically.
--
error compiling committee.c: too many arguments to function
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next prev parent reply other threads:[~2010-04-06 11:57 UTC|newest]
Thread overview: 205+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-02 0:41 [PATCH 00 of 41] Transparent Hugepage Support #17 Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 01 of 41] define MADV_HUGEPAGE Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 02 of 41] compound_lock Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 03 of 41] alter compound get_page/put_page Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 04 of 41] update futex compound knowledge Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 05 of 41] fix bad_page to show the real reason the page is bad Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 06 of 41] clear compound mapping Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 07 of 41] add native_set_pmd_at Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 08 of 41] add pmd paravirt ops Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 09 of 41] no paravirt version of pmd ops Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 10 of 41] export maybe_mkwrite Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 11 of 41] comment reminder in destroy_compound_page Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 12 of 41] config_transparent_hugepage Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 13 of 41] special pmd_trans_* functions Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 14 of 41] add pmd mangling generic functions Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 15 of 41] add pmd mangling functions to x86 Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 16 of 41] bail out gup_fast on splitting pmd Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 17 of 41] pte alloc trans splitting Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 18 of 41] add pmd mmu_notifier helpers Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 19 of 41] clear page compound Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 20 of 41] add pmd_huge_pte to mm_struct Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 21 of 41] split_huge_page_mm/vma Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 22 of 41] split_huge_page paging Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 23 of 41] clear_copy_huge_page Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 24 of 41] kvm mmu transparent hugepage support Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 25 of 41] _GFP_NO_KSWAPD Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 26 of 41] don't alloc harder for gfp nomemalloc even if nowait Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 27 of 41] transparent hugepage core Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 28 of 41] verify pmd_trans_huge isn't leaking Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 29 of 41] madvise(MADV_HUGEPAGE) Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 30 of 41] pmd_trans_huge migrate bugcheck Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 31 of 41] memcg compound Andrea Arcangeli
2010-04-02 0:41 ` [PATCH 32 of 41] memcg huge memory Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 33 of 41] transparent hugepage vmstat Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 34 of 41] khugepaged Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 35 of 41] skip transhuge pages in ksm for now Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 36 of 41] remove PG_buddy Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 37 of 41] add x86 32bit support Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 38 of 41] mincore transparent hugepage support Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 39 of 41] add pmd_modify Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 40 of 41] mprotect: pass vma down to page table walkers Andrea Arcangeli
2010-04-02 0:42 ` [PATCH 41 of 41] mprotect: transparent huge page support Andrea Arcangeli
2010-04-05 19:09 ` [PATCH 00 of 41] Transparent Hugepage Support #17 Andrew Morton
2010-04-05 19:36 ` Ingo Molnar
2010-04-05 20:26 ` Pekka Enberg
2010-04-05 20:32 ` Linus Torvalds
2010-04-05 20:46 ` Pekka Enberg
2010-04-05 20:58 ` Linus Torvalds
2010-04-05 21:54 ` Ingo Molnar
2010-04-05 23:21 ` Andrea Arcangeli
2010-04-06 0:26 ` Linus Torvalds
2010-04-06 1:08 ` [RFD] " Linus Torvalds
2010-04-06 1:26 ` Andrea Arcangeli
2010-04-06 1:35 ` Linus Torvalds
2010-04-06 1:13 ` Andrea Arcangeli
2010-04-06 1:38 ` Linus Torvalds
2010-04-06 2:23 ` Linus Torvalds
2010-04-06 5:25 ` Nick Piggin
2010-04-06 9:08 ` Ingo Molnar
2010-04-06 9:13 ` Ingo Molnar
2010-04-10 18:47 ` Andrea Arcangeli
2010-04-10 19:02 ` Ingo Molnar
2010-04-10 19:22 ` Avi Kivity
2010-04-10 19:47 ` Ingo Molnar
2010-04-10 20:00 ` Andrea Arcangeli
2010-04-10 20:10 ` Andrea Arcangeli
2010-04-10 20:21 ` Jason Garrett-Glaser
2010-04-10 20:24 ` Avi Kivity
2010-04-10 20:42 ` Avi Kivity
2010-04-10 20:47 ` Andrea Arcangeli
2010-04-10 21:00 ` Avi Kivity
2010-04-10 21:47 ` Andrea Arcangeli
2010-04-11 1:05 ` Andrea Arcangeli
2010-04-11 11:24 ` Ingo Molnar
2010-04-11 11:33 ` Avi Kivity
2010-04-11 12:11 ` Ingo Molnar
2010-04-25 19:27 ` Andrea Arcangeli
2010-04-26 18:01 ` Andrea Arcangeli
2010-04-30 9:55 ` Ingo Molnar
2010-04-30 15:19 ` Andrea Arcangeli
2010-05-02 12:17 ` Ingo Molnar
2010-04-10 20:49 ` Jason Garrett-Glaser
2010-04-10 20:53 ` Avi Kivity
2010-04-10 20:58 ` Jason Garrett-Glaser
2010-04-11 9:29 ` Avi Kivity
2010-04-11 9:37 ` Jason Garrett-Glaser
2010-04-11 9:40 ` Avi Kivity
2010-04-11 10:22 ` Jason Garrett-Glaser
2010-04-11 11:00 ` Ingo Molnar
2010-04-11 11:19 ` Avi Kivity
2010-04-11 11:30 ` Jason Garrett-Glaser
2010-04-11 11:52 ` hugepages will matter more in the future Ingo Molnar
2010-04-11 12:01 ` Avi Kivity
2010-04-11 12:35 ` Ingo Molnar
2010-04-11 15:22 ` Linus Torvalds
2010-04-11 15:43 ` Avi Kivity
2010-04-11 15:52 ` Linus Torvalds
2010-04-11 16:04 ` Avi Kivity
2010-04-12 7:45 ` Ingo Molnar
2010-04-12 8:14 ` Nick Piggin
2010-04-12 8:22 ` Ingo Molnar
2010-04-12 8:34 ` Nick Piggin
2010-04-12 8:47 ` Avi Kivity
2010-04-12 8:45 ` Andrea Arcangeli
2010-04-11 19:35 ` Andrea Arcangeli
2010-04-12 16:20 ` Rik van Riel
2010-04-12 16:40 ` Linus Torvalds
2010-04-12 16:56 ` Linus Torvalds
2010-04-12 17:06 ` Randy Dunlap
2010-04-12 17:36 ` Andrea Arcangeli
2010-04-12 17:46 ` Rik van Riel
2010-04-11 19:40 ` Andrea Arcangeli
2010-04-12 15:41 ` Linus Torvalds
2010-04-12 11:22 ` Arjan van de Ven
2010-04-12 11:29 ` Avi Kivity
2010-04-17 15:12 ` Arjan van de Ven
2010-04-17 18:18 ` Avi Kivity
2010-04-17 19:05 ` Arjan van de Ven
2010-04-17 19:05 ` Avi Kivity
2010-04-17 19:18 ` Arjan van de Ven
2010-04-17 19:20 ` Avi Kivity
2010-04-12 13:30 ` Andrea Arcangeli
2010-04-12 13:33 ` Avi Kivity
2010-04-12 13:39 ` Andrea Arcangeli
2010-04-12 13:53 ` Avi Kivity
2010-04-13 11:38 ` Ingo Molnar
2010-04-13 13:17 ` Andrea Arcangeli
2010-04-11 10:46 ` [PATCH 00 of 41] Transparent Hugepage Support #17 Ingo Molnar
2010-04-11 10:49 ` Ingo Molnar
2010-04-11 11:30 ` Avi Kivity
2010-04-11 12:08 ` Ingo Molnar
2010-04-11 12:24 ` Avi Kivity
2010-04-11 12:46 ` Ingo Molnar
2010-04-12 6:09 ` Nick Piggin
2010-04-12 6:18 ` Pekka Enberg
2010-04-12 6:48 ` Nick Piggin
2010-04-12 14:29 ` Christoph Lameter
2010-04-12 16:06 ` Nick Piggin
2010-04-12 6:36 ` Avi Kivity
2010-04-12 6:55 ` Ingo Molnar
2010-04-12 7:15 ` Nick Piggin
2010-04-12 7:45 ` Avi Kivity
2010-04-12 8:28 ` Nick Piggin
2010-04-12 9:01 ` Andrea Arcangeli
2010-04-12 9:03 ` Avi Kivity
2010-04-12 9:26 ` Nick Piggin
2010-04-12 9:39 ` Andrea Arcangeli
2010-04-12 10:02 ` Avi Kivity
2010-04-12 10:08 ` Andrea Arcangeli
2010-04-12 10:10 ` Avi Kivity
2010-04-12 10:23 ` Andrea Arcangeli
2010-04-12 10:37 ` Nick Piggin
2010-04-12 10:59 ` Avi Kivity
2010-04-12 12:23 ` Avi Kivity
2010-04-12 13:25 ` Andrea Arcangeli
2010-04-13 0:38 ` Andrew Morton
2010-04-13 6:18 ` Neil Brown
2010-04-13 13:31 ` Andrea Arcangeli
2010-04-13 13:40 ` Mel Gorman
2010-04-13 13:44 ` Andrea Arcangeli
2010-04-13 13:55 ` Mel Gorman
2010-04-13 14:03 ` Andrea Arcangeli
2010-04-12 7:51 ` Ingo Molnar
2010-04-12 7:18 ` Andrea Arcangeli
2010-04-12 6:49 ` Ingo Molnar
2010-04-12 7:35 ` Andrea Arcangeli
2010-04-12 7:08 ` Andrea Arcangeli
2010-04-12 7:21 ` Nick Piggin
2010-04-12 7:50 ` Avi Kivity
2010-04-12 8:07 ` Ingo Molnar
2010-04-12 8:21 ` Andrea Arcangeli
2010-04-12 10:27 ` Mel Gorman
2010-04-12 8:18 ` Andrea Arcangeli
2010-04-12 8:06 ` Andrea Arcangeli
2010-04-12 10:44 ` Mel Gorman
2010-04-12 11:12 ` Avi Kivity
2010-04-12 13:17 ` Andrea Arcangeli
2010-04-12 14:24 ` Christoph Lameter
2010-04-12 14:49 ` Avi Kivity
2010-04-06 9:55 ` Avi Kivity
2010-04-06 9:57 ` Avi Kivity
2010-04-06 11:55 ` Avi Kivity [this message]
2010-04-06 13:10 ` Nick Piggin
2010-04-06 13:22 ` Avi Kivity
2010-04-06 13:45 ` Nick Piggin
2010-04-06 13:57 ` Avi Kivity
2010-04-06 16:50 ` Andrea Arcangeli
2010-04-06 17:31 ` Avi Kivity
2010-04-06 18:00 ` Christoph Lameter
2010-04-06 18:04 ` Avi Kivity
2010-04-06 18:47 ` Avi Kivity
2010-04-06 14:44 ` Rik van Riel
2010-04-06 16:43 ` Andrea Arcangeli
2010-04-06 9:30 ` Mel Gorman
2010-04-06 10:32 ` Theodore Tso
2010-04-06 11:16 ` Mel Gorman
2010-04-06 13:13 ` Theodore Tso
2010-04-06 14:55 ` Mel Gorman
2010-04-06 16:46 ` Andrea Arcangeli
2010-04-05 21:01 ` Chris Mason
2010-04-05 21:18 ` Avi Kivity
2010-04-05 21:33 ` Linus Torvalds
2010-04-05 22:33 ` Chris Mason
2010-04-06 8:30 ` Mel Gorman
2010-04-06 11:35 ` Chris Mason
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