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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)


  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 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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