From owner-freebsd-jail@FreeBSD.ORG Wed Apr 22 09:50:08 2009 Return-Path: Delivered-To: freebsd-jail@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 048FC106566B; Wed, 22 Apr 2009 09:50:08 +0000 (UTC) (envelope-from bzeeb-lists@lists.zabbadoz.net) Received: from mail.cksoft.de (mail.cksoft.de [195.88.108.3]) by mx1.freebsd.org (Postfix) with ESMTP id B1A1A8FC0C; Wed, 22 Apr 2009 09:50:07 +0000 (UTC) (envelope-from bzeeb-lists@lists.zabbadoz.net) Received: from localhost (amavis.fra.cksoft.de [192.168.74.71]) by mail.cksoft.de (Postfix) with ESMTP id 7FD3B41C758; Wed, 22 Apr 2009 11:50:06 +0200 (CEST) X-Virus-Scanned: amavisd-new at cksoft.de Received: from mail.cksoft.de ([195.88.108.3]) by localhost (amavis.fra.cksoft.de [192.168.74.71]) (amavisd-new, port 10024) with ESMTP id ICYddnT3d3yE; Wed, 22 Apr 2009 11:50:06 +0200 (CEST) Received: by mail.cksoft.de (Postfix, from userid 66) id 300BC41C757; Wed, 22 Apr 2009 11:50:06 +0200 (CEST) Received: from maildrop.int.zabbadoz.net (maildrop.int.zabbadoz.net [10.111.66.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.int.zabbadoz.net (Postfix) with ESMTP id 949EF4448E6; Wed, 22 Apr 2009 09:47:50 +0000 (UTC) Date: Wed, 22 Apr 2009 09:47:50 +0000 (UTC) From: "Bjoern A. Zeeb" X-X-Sender: bz@maildrop.int.zabbadoz.net To: Miroslav Lachman <000.fbsd@quip.cz> In-Reply-To: <49EE4B6B.5020005@quip.cz> Message-ID: <20090422094447.A15361@maildrop.int.zabbadoz.net> References: <49EE4B6B.5020005@quip.cz> X-OpenPGP-Key: 0x14003F198FEFA3E77207EE8D2B58B8F83CCF1842 MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: freebsd-jail@freebsd.org, freebsd-stable@freebsd.org Subject: Re: changing cpuset of jail from inside of jail - is it feature? X-BeenThere: freebsd-jail@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: freebsd-jail@freebsd.org List-Id: "Discussion about FreeBSD jail\(8\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Apr 2009 09:50:08 -0000 On Wed, 22 Apr 2009, Miroslav Lachman wrote: Hi, > I am running system FreeBSD 7.1-STABLE amd64 GENERIC (Wed Feb 11 09:56:08 CET > 2009) hosting few jails. > The machine has dual core CPU and some jails are set to run only on one core > (core 0 in this example): > > host# cpuset -l 0 -j 25 > > As I tested today, root user inside the jail can change this by the same > command as I am doing it from the host system: > > injail# cpuset -l 0,1 -j 25 > > And from now, jail with JID 25 is running on both cores. > > Is it expected behavior of cpuset to allow user inside the jail change cpuset > of the jail itself or is it a bug? > > It seems to me as undesirable. it is (undesirable) and it seems to be a bug as even if you do host# cpuset -l 0 -r -j 25 you can get back to 0,1 from within the jail. I'll check how/why this is possible. /bz PS: moving this to freebsd-jail@ -- Bjoern A. Zeeb The greatest risk is not taking one.