From: David Laight <David.Laight@ACULAB.COM>
To: 'Andi Kleen' <ak@linux.intel.com>, Michal Hocko <mhocko@kernel.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
Cannon Matthews <cannonmatthews@google.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
David Rientjes <rientjes@google.com>,
Greg Thelen <gthelen@google.com>, Salman Qazi <sqazi@google.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>
Subject: RE: [PATCH] mm: clear 1G pages with streaming stores on x86
Date: Wed, 11 Mar 2020 15:07:07 +0000 [thread overview]
Message-ID: <ee18a6c4bb684b24afa4ae980de5c878@AcuMS.aculab.com> (raw)
In-Reply-To: <20200309153831.GK1454533@tassilo.jf.intel.com>
From: Andi Kleen
> Sent: 09 March 2020 15:39
...
> There's a cautious tale of the old crappy RAID5 XOR assembler functions which
> were optimized a long time ago for the Pentium1, and stayed around,
> even though the compiler could actually do a better job.
Or the amd64 asm loop for doing the IP checksum.
I doubt it was even the fastest version when it was written.
A whole set of Intel cpus can run twice as fast as that version
with less loop unrolling (and associated code for 'odd' lengths).
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2020-03-11 15:07 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-07 1:03 [PATCH] mm: clear 1G pages with streaming stores on x86 Cannon Matthews
2020-03-07 22:06 ` Andrew Morton
2020-03-09 0:08 ` Kirill A. Shutemov
2020-03-09 9:06 ` Michal Hocko
2020-03-09 9:35 ` Kirill A. Shutemov
2020-03-09 11:36 ` Kirill A. Shutemov
2020-03-09 12:26 ` Michal Hocko
2020-03-09 18:01 ` Mike Kravetz
2020-03-09 15:38 ` Andi Kleen
2020-03-09 18:37 ` Matthew Wilcox
2020-03-11 0:21 ` Cannon Matthews
2020-03-11 0:54 ` Kirill A. Shutemov
2020-03-11 3:35 ` Arvind Sankar
2020-03-11 8:16 ` Kirill A. Shutemov
2020-03-11 18:32 ` Arvind Sankar
2020-03-11 20:32 ` Arvind Sankar
2020-03-12 0:52 ` Kirill A. Shutemov
2020-03-31 0:40 ` Elliott, Robert (Servers)
2020-03-16 10:18 ` Michal Hocko
2020-03-16 12:19 ` Kirill A. Shutemov
2020-03-26 19:46 ` Matthew Wilcox
2020-03-11 15:07 ` David Laight [this message]
2020-03-09 15:33 ` Andi Kleen
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