From: Andi Kleen <ak@linux.intel.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Jan Beulich <JBeulich@suse.com>,
Andy Lutomirski <luto@amacapital.net>,
Robert Richter <robert.richter@amd.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Hugh Dickins <hughd@google.com>, Alex Shi <alex.shu@intel.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
x86@kernel.org, linux-mm@kvack.org,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mips@linux-mips.org, Tim Chen <tim.c.chen@linux.intel.com>,
linuxppc-dev@lists.ozlabs.org,
Andrea Arcangeli <aarcange@redhat.com>,
Ingo Molnar <mingo@redhat.com>, Mel Gorman <mgorman@suse.de>,
linux-kernel@vger.kernel.org, linux-sh@vger.kernel.org,
sparclinux@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v2 4/6] x86: Add clear_page_nocache
Date: Mon, 13 Aug 2012 09:27:53 -0700 [thread overview]
Message-ID: <20120813162753.GM2644@tassilo.jf.intel.com> (raw)
In-Reply-To: <20120813114334.GA21855@otc-wbsnb-06>
> Moving 64 bytes per cycle is faster on Sandy Bridge, but slower on
> Westmere. Any preference? ;)
You have to be careful with these benchmarks.
- You need to make sure the data is cache cold, cache hot is misleading.
- The numbers can change if you have multiple CPUs doing this in parallel.
-Andi
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2012-08-13 16:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-09 15:02 [PATCH v2 0/6] Avoid cache trashing on clearing huge/gigantic page Kirill A. Shutemov
2012-08-09 15:02 ` [PATCH v2 1/6] THP: Use real address for NUMA policy Kirill A. Shutemov
2012-08-09 15:02 ` [PATCH v2 2/6] mm: make clear_huge_page tolerate non aligned address Kirill A. Shutemov
2012-08-09 15:03 ` [PATCH v2 3/6] THP: Pass real, not rounded, address to clear_huge_page Kirill A. Shutemov
2012-08-09 15:03 ` [PATCH v2 4/6] x86: Add clear_page_nocache Kirill A. Shutemov
2012-08-09 15:22 ` Jan Beulich
2012-08-09 15:26 ` Andi Kleen
2012-08-13 11:43 ` Kirill A. Shutemov
2012-08-13 12:02 ` Jan Beulich
2012-08-13 16:27 ` Andi Kleen [this message]
2012-08-13 17:04 ` Borislav Petkov
2012-08-13 19:07 ` Kirill A. Shutemov
2012-08-09 15:23 ` H. Peter Anvin
2012-08-09 15:03 ` [PATCH v2 5/6] mm: make clear_huge_page cache clear only around the fault address Kirill A. Shutemov
2012-08-09 15:03 ` [PATCH v2 6/6] x86: switch the 64bit uncached page clear to SSE/AVX v2 Kirill A. Shutemov
2012-08-09 15:28 ` Jan Beulich
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120813162753.GM2644@tassilo.jf.intel.com \
--to=ak@linux.intel.com \
--cc=JBeulich@suse.com \
--cc=aarcange@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=alex.shu@intel.com \
--cc=hannes@cmpxchg.org \
--cc=hpa@zytor.com \
--cc=hughd@google.com \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@linux-mips.org \
--cc=linux-mm@kvack.org \
--cc=linux-sh@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=luto@amacapital.net \
--cc=mgorman@suse.de \
--cc=mingo@redhat.com \
--cc=robert.richter@amd.com \
--cc=sparclinux@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=tim.c.chen@linux.intel.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox