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identity=mailfrom; envelope-from="miller@hamnavoe.com"; helo=mx2.mythic-beasts.com; client-ip=46.235.227.24 Received: from mx2.mythic-beasts.com (mx2.mythic-beasts.com [46.235.227.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by tb-mx0.topicbox.com (Postfix) with ESMTPS for <9fans@9fans.net>; Sat, 4 Jun 2022 08:21:00 -0400 (EDT) (envelope-from miller@hamnavoe.com) Received: from [88.97.27.83] (port=60000 helo=hamnavoe.com) by balrog.mythic-beasts.com with esmtpsa (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.92.3) (envelope-from ) id 1nxSlz-0007Mg-7G for 9fans@9fans.net; Sat, 04 Jun 2022 13:20:59 +0100 Message-ID: <11526749f3706d057cd8377820cec14f@hamnavoe.com> To: 9fans@9fans.net From: Richard Miller <9fans@hamnavoe.com> Date: Sat, 4 Jun 2022 13:20:53 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-BlackCat-Spam-Score: 1 Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: cfe302c2-e400-11ec-9422-f9451c3686d6 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UMmIzZTk1MWRiOWY3YzE3Zi1NYmFjZDRjZmNiMjllY2E2ZGFkYzJh?= =?UTF-8?B?NzdhPg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> Subject: [9fans] LPAE patch for ARM List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:Mbacd4cfcb29eca6dadc2a77a:1:C-bA4O185gabO5poYHr6HZ-DE1wbs3LsehHd-Qb49aw There's a new patch bcm-lpae which uses the 64-bit page table format to allow 32-bit ARM kernels to support more than 4GB of physical memory. At present this is mainly of interest for the 8GB Raspberry Pi 4, but there's nothing Pi-specific in the MMU code so it may have future application for bigger ARM systems. The LPAE page table format works on the Pi 2 and Pi 3 as well, where it may provide a wee performance improvement from simpler page fault handling. When building a bcm kernel, the choice of page descriptor format is determi= ned by putting either 'mmu' or 'mmu64' in the 'misc' section of the config file. The patch has been applied in the current 9legacy SD card image for Raspber= ry Pi on http://9legacy.org/download.html, and also in the 9pi SD card image on http://9p.io/sources/contrib/miller (though nowadays for all practical purp= oses I recommend 9legacy as a better choice). If you just want to update the ker= nel, source is in http://9p.io/sources/contrib/miller/9/bcm as usual. ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T2b3e951db9f7c17f-Mbacd4= cfcb29eca6dadc2a77a Delivery options: https://9fans.topicbox.com/groups/9fans/subscription