From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9835C433EF for ; Thu, 21 Oct 2021 13:16:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE17F610CB for ; Thu, 21 Oct 2021 13:16:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230375AbhJUNTE convert rfc822-to-8bit (ORCPT ); Thu, 21 Oct 2021 09:19:04 -0400 Received: from mailin.dlr.de ([194.94.201.12]:52009 "EHLO mailin.dlr.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230283AbhJUNTD (ORCPT ); Thu, 21 Oct 2021 09:19:03 -0400 X-IPAS-Result: =?us-ascii?q?A2GJBAAIZ3Fh/xaKuApagQmBWYMLgWKaDZdkgXwLAQEBA?= =?us-ascii?q?QEBAQEBCAFBBAEBh1AmNgcOAQIEAQEBAQMCAwEBAQEBAQMBAQYBAQEBAQEFB?= =?us-ascii?q?AEBAoEghS9GgjUihDVRAT5CJgEEG7J2gTOBAYRphQ+BOoV9VIoVhBABhX6FM?= =?us-ascii?q?ASNFsJ7B4IJgTGeXy8Ug1gBkhORMZYNoHGFCQIEAgQFAhaBaASCCnGDOVAXA?= =?us-ascii?q?g+ccIEsAgYLAQEDCY88gRABAQ?= IronPort-PHdr: A9a23:yUGs/B/w3SEI3v9uWRi8ngc9DxPPW53KNwIYoqAql6hJOvz6uci4Z AqFv6sm0Q6BdL6YwsoMs/DRvaHkVD5Iyre6m1dGTqZxUQQYg94dhQ0qDZ3NI0T6KPn3c35yR 5waBxdq8H6hLEdaBtv1aUHMrX2u9z4SHQj0ORZoKujvFYPekdi72/qs95HNYghEizqwbLdvJ xiqsAvdsdUbj5F/Iagr0BvJpXVIe+VSxWx2IF+Yggjx6MSt8pN96ipco/0u+dJOXqX8ZKQ4U KdXDC86PGAv5c3krgfMQA2S7XYBSGoWkx5IAw/Y7BHmW5r6ryX3uvZh1CScIMb7S60/Vza/4 KdxUBLmiDkJOSMl8G/ZicJwjb5Urh2uqBFk347UeYOVOOZicq/BY98XQ3dKUMZLVyxGB4Oxd 4wCAvYAPOlCs4nxvUMArQakBQmjHuzvzj5IiWHo3aAhzushFRvG0BY9EN0QqXnZqsj+O6gOX +6v1qbI0SnDYO1M2Tf78IXFfB8srPCQUL9xf8TcylQiGg3KgFiftIHpIzOY2+QQvmSG7uduW +Gih3M7pwxsrTaixNshh5TNi48X11zI6St0zYAoLtO7UE52ecOoHIdKuy2HNIZ7TdkuT3xmt Ss50LEKp4C3cDAXxJkl2RLTceKLf5WS7h7+VuucIC10iG9jdbminRi961Kgxff5VsSs1VZKq TdKncfUu3AW0hzT9tCHSvxg/ke9wTqP1x7c6uVDIU0sm6TVLZAvzLEwmJQTtkrNHSj4ll/og KOIeUsr+/al5/7mYrXgup+cLZV7hhvjPaQqgMyzG/k3PRYWU2ia/+SzyqHj8FXkTLlWlPE6j 6rUvZ/AKcgGqKO0ABVZ3pg95xqnCjepytUYnX0JLFJffxKHipDkNk3PIf/iEfezmUyikCpxx /DJJLLhBpTNIWbdkLr6YLl971RcxBAuwt9B/55UEK0OIOrvWk/ts9zVFhs5Mw2yw+b6B9Rxz 40eWXmSDaCHLqPdr1uI6/kxI+mDeoAVoizxK/s76P70i382h1sdcbOu3ZsNZ3DrVshhdhGdY HzxkpIPCmsHoAc6ZPLlhUfEUjNJYXu2GaUm6WdoJpihCNKXb5KknPqnwT20F5lXa35uBlSWV 3vlIdbXE8wQYT6fd5cy2gcPUqKsHtdJ6A== IronPort-Data: A9a23:TCcr8K5HmbFg0qzpCaU6YAxRtKLFchMFZxGqfqrLsTDasY5as4F+v mFMUGmObvrcMGX8e9EgOdy29hhSvsLdxtVlSlQ4r3swZn8b8sCt6fZ1j6vT04F+CuWZESqLO u1HMoGowPgcFyOa/lH0WlTYhSEUOZugH9IQM8aZfHAuLeNYYH1500s6w7Rg2tcAbeWRWmthh /uj+6UzB3f4g1aYAkpMg05UgEoy1BhakGpwUm0WPZinjneH/5UmJM53yZWKEpfNatI88thW5 gr05OrREmvxp3/BAz4++1rxWhVirrX6ZWBihpfKMkQLb9crSiEai84G2PQghUh/lBzOv+5L9 I53trurWwIJAI2Pqe4bXEwNe81+FfUuFL7vDVyTnOK96mzjSyG27sVFSkAwIZcRvOpzGydC+ JT0KhhUNlba177wmenrDLM27iggBJCD0Ic3k2Np0Xf/EOwpSJTCTrvi6dtCmjs97ixLNauPO ZFGOGY3BPjGSx1KInYxWKxvp+ChjV28bBB3iHGsjoNitgA/yyQ0itABKuH9ft2MWNUQkF2Uq 3zL+0znDRwAct+S0zyI9jSrnOCnoM/gcI4WGLC2+PtrhUXJnGEDA1sXU0ehqL+1jlT4V983x 1EoxxfCZJMarCSDJuQRlTXjyJJYlnbwg+ZtLtA= IronPort-HdrOrdr: A9a23:AW6uCahgqgOdTawxrzlleRnnZHBQXgMji2hC6mlwRA09TyX4rb HSoB1/73TJYVkqOU3I5urwXpVoLUmxyXc32/hpAV7aZnichILwFvAZ0WKA+UydJ8SdzI5gPM 5bGsAVNDSXNzdHZK3BjTVQfexP/DH7mJrY/ds2G00dLz2DF8lbnmBE436gYy5Lrf59dP4E/T Onl696mwY= X-IronPort-Anti-Spam-Filtered: true X-IronPort-AV: E=Sophos;i="5.87,169,1631570400"; d="scan'208";a="59637940" From: To: Subject: Turn off readahead completely Thread-Topic: Turn off readahead completely Thread-Index: AdfGfdxpjOk8ymokTbSOj+D6SC4J2w== Date: Thu, 21 Oct 2021 13:16:46 +0000 Message-ID: <8aa213d5d5464236b7e47aaa6bb93bb8@dlr.de> Accept-Language: en-GB, en-US, de-DE Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-tm-snts-smtp: 4FCDBC6963BD3DC2CEC786D70BB33D9126CF53FAA534CED031CDA00364D96CF72000:8 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello everyone, I need to turn readahead off completely in order to do my experiments. Is there any way to turn it off completely? Setting /sys/block//queue/read_ahead_kb to 0 causes readahead to become 4kb. Thanks, Azat