From: "H. Peter Anvin" <hpa@zytor.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Andi Kleen <ak@suse.de>, Linus Torvalds <torvalds@transmeta.com>,
Brian Gerst <bgerst@didntduck.org>,
linux-kernel@vger.kernel.org, jh@suse.cz
Subject: Re: [PATCH] Re: SSE related security hole
Date: Sat, 20 Apr 2002 15:43:17 -0700 [thread overview]
Message-ID: <3CC1EF05.6000702@zytor.com> (raw)
In-Reply-To: <20020420201205.M1291@dualathlon.random> <Pine.LNX.4.33.0204201221120.11732-100000@penguin.transmeta.com> <20020420214114.A11894@wotan.suse.de> <20020420232818.N1291@dualathlon.random>
Andrea Arcangeli wrote:
>
> As said in an earlier email it is a matter of memory bandwith, 59 bytes
> of icache and zero data, against 7 bytes of icache and 512bytes of data.
> the 512bytes of data are visibly slower, period. Saving mem bandwith is
> much more important than reducing the number of instructions, even more
> on SMP!
>
It's not 512 bytes of data -- only the part that's actually used is
accessed.
-hpa
next prev parent reply other threads:[~2002-04-20 22:43 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20020418183639.20946.qmail@science.horizon.com.suse.lists.linux.kernel>
[not found] ` <a9ncgs$2s2$1@cesium.transmeta.com.suse.lists.linux.kernel>
2002-04-19 14:06 ` SSE related security hole Andi Kleen
2002-04-19 18:00 ` Doug Ledford
2002-04-19 21:04 ` Andrea Arcangeli
2002-04-19 21:35 ` H. Peter Anvin
2002-04-19 21:42 ` Andi Kleen
2002-04-20 3:23 ` Andrea Arcangeli
2002-04-19 23:12 ` [PATCH] " Brian Gerst
2002-04-19 23:41 ` Linus Torvalds
2002-04-20 0:01 ` H. Peter Anvin
2002-04-20 0:09 ` Linus Torvalds
2002-04-20 0:11 ` Brian Gerst
2002-04-20 0:19 ` H. Peter Anvin
2002-04-20 0:29 ` Linus Torvalds
2002-04-20 0:31 ` Alan Cox
2002-04-20 0:08 ` Brian Gerst
2002-04-20 0:21 ` Linus Torvalds
2002-04-20 4:21 ` Andrea Arcangeli
2002-04-20 4:35 ` Linus Torvalds
2002-04-20 5:07 ` Andrea Arcangeli
2002-04-20 16:27 ` Linus Torvalds
2002-04-20 17:27 ` Andrea Arcangeli
2002-04-20 17:38 ` Linus Torvalds
2002-04-20 18:12 ` Andrea Arcangeli
2002-04-20 19:30 ` Linus Torvalds
2002-04-20 19:41 ` Andi Kleen
2002-04-20 21:28 ` Andrea Arcangeli
2002-04-20 22:43 ` H. Peter Anvin [this message]
2002-04-21 2:09 ` Andrea Arcangeli
2002-04-20 23:23 ` Linus Torvalds
2002-04-21 2:08 ` Andrea Arcangeli
2002-04-20 23:13 ` Linus Torvalds
2002-04-23 19:21 ` Linus Torvalds
2002-04-23 20:05 ` H. Peter Anvin
2002-04-24 0:32 ` Andrea Arcangeli
2002-04-24 2:10 ` Linus Torvalds
2002-04-26 9:13 ` Pavel Machek
2002-04-26 11:55 ` Andrea Arcangeli
2002-04-19 22:18 ` Jan Hubicka
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