From: Manfred Spraul <manfred@colorfullife.com>
To: Adrian Bunk <bunk@fs.tum.de>
Cc: linux-kernel@vger.kernel.org, peter_daum@t-online.de
Subject: Re: [2.4 patch] fix CONFIG_X86_L1_CACHE_SHIFT
Date: Sun, 07 Sep 2003 22:36:19 +0200 [thread overview]
Message-ID: <3F5B96C3.1060706@colorfullife.com> (raw)
Adrian wrote:
>With CONFIG_M686 CONFIG_X86_L1_CACHE_SHIFT was set to 5, but a Pentium 4
>requires 7.
>
>
Why requires? On x86, the cpu caches are fully coherent. A too small L1
cache shift results in false sharing on SMP, but it shouldn't cause the
described problems.
And obviously: Pentium II cpus have a 32 byte cache line, increasing the
L1 setting to 128 bytes only helps by chance.
My bet is that someone overwrites critical memory structures, and with
more padding, the critical stuff is further away.
--
Manfred
next reply other threads:[~2003-09-07 20:36 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-07 20:36 Manfred Spraul [this message]
2003-09-08 14:20 ` [2.4 patch] fix CONFIG_X86_L1_CACHE_SHIFT Adrian Bunk
2003-09-08 17:07 ` Jamie Lokier
2003-09-08 17:24 ` Jeff Garzik
2003-09-08 19:45 ` Manfred Spraul
2003-09-09 14:49 ` Peter Daum
[not found] <20030907195557.GK14436@fs.tum.de.suse.lists.linux.kernel>
2003-09-07 20:30 ` Andi Kleen
2003-09-07 21:39 ` Dave Jones
2003-09-08 8:15 ` Peter Daum
[not found] ` <Pine.LNX.4.30.0309072228110.9987-100000@swamp.bayern.net.suse.lists.linux.kernel>
2003-09-07 21:57 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2003-09-07 19:55 Adrian Bunk
2003-09-07 20:59 ` Peter Daum
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=3F5B96C3.1060706@colorfullife.com \
--to=manfred@colorfullife.com \
--cc=bunk@fs.tum.de \
--cc=linux-kernel@vger.kernel.org \
--cc=peter_daum@t-online.de \
/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