From owner-freebsd-hackers@freebsd.org Mon Aug 20 15:22:59 2018 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6663D107220B for ; Mon, 20 Aug 2018 15:22:59 +0000 (UTC) (envelope-from danilogondolfo@gmail.com) Received: from mail-ua1-x936.google.com (mail-ua1-x936.google.com [IPv6:2607:f8b0:4864:20::936]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 0198E72878 for ; Mon, 20 Aug 2018 15:22:59 +0000 (UTC) (envelope-from danilogondolfo@gmail.com) Received: by mail-ua1-x936.google.com with SMTP id o11-v6so9960758uak.5 for ; Mon, 20 Aug 2018 08:22:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=HCD1EPZlFJzDN5nIEVBMaLiYos+YkeUQf+4BjYjs+/Y=; b=kx0swjshTHGTDA4r6cKeK313WVdobhBuhcxsvTyv/0+cxbWK5UtSaj05W4kePPndoV lr9Qcm4ZPgwRci38473wjep4XiG6pP8jy3xJR4LAou/WGX4X+SjtDuukaX0ejwtNBm2J 2/Rlb8E3AqqhTinwq46Z2ckIV7UPcLSG/NXE7q1NvpeZ03kQNP9G5JDsO4MZ0lu/YFZB 0XV1FwyGOiWOzBtRAiiS9Pt/SEJCNQiyWzl/my7CKKNU7//0oCg0GS4eMwl8mov+7TyI Hvk2jtiSD/5FnXmaW+LSlPFrV9iCZ/NfqFJQUUCjHlCmnrNNa2SLfcYtPrEjsuY6wjkR D7Ng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=HCD1EPZlFJzDN5nIEVBMaLiYos+YkeUQf+4BjYjs+/Y=; b=t2tAFHtPSSy8MeU8MgThUBsfMHCGVYMILJ9nepQDwBEBROdeeKigD8TBjT4GdUEblJ ZD37xH1Vdf5BTCWF/TeIO6PHxq6X7Er8ez4yZOcVTnAr9GCksNQeuCBGr9tHhgIeeOTo ZYWDKtCRM1/tvJheZhPiaJTu4+sBr2vVLn2r/VO+ULT2CleTs2O7s9t4G2foGWcsFbFT kXOxysL0MvFJ/0zLumKmPnSuud7000mruWgNISMYcHjQ6j6J4KEwkLq0rGlGqtAymADK WskhwA0md+BU/MGd1guZwDol0Tx/4/gqrJ5LoVngWE+uCLs/dffEwMg19hsm4WkofWyu IanQ== X-Gm-Message-State: AOUpUlGfLQRwRGoYKYAYc+474+4S3d+zuGCtOwZ6V5y+OYWA12viuYmZ +0ya9gkjZirkLFZzkIGHuRJdlKupik09xH3PC5/HvtO5 X-Google-Smtp-Source: AA+uWPwCgwBOFupidyU/NIyRe9DWKkyojebTSBXoySEWjvvob/O+TcD5jQ4tvan+YAnDctAVYXSxRgaHiaTq48RZGdo= X-Received: by 2002:ab0:1544:: with SMTP id p4-v6mr30452747uae.81.1534778578359; Mon, 20 Aug 2018 08:22:58 -0700 (PDT) MIME-Version: 1.0 References: <95C34771-8D0B-489A-88DA-09AF0D244A1C@yahoo.com> In-Reply-To: <95C34771-8D0B-489A-88DA-09AF0D244A1C@yahoo.com> From: =?UTF-8?Q?Danilo_Eg=C3=AAa_Gondolfo?= Date: Mon, 20 Aug 2018 12:23:46 -0300 Message-ID: Subject: Re: rand_harvestq high cpu usage when /dev/urandom is used To: marklmi@yahoo.com Cc: aliovx@gmail.com, freebsd-hackers@freebsd.org X-Mailman-Approved-At: Mon, 20 Aug 2018 16:12:25 +0000 Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.27 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 20 Aug 2018 15:22:59 -0000 On Mon, Aug 20, 2018 at 8:54 AM Mark Millard via freebsd-hackers < freebsd-hackers@freebsd.org> wrote: > > > On 2018-Aug-20, at 4:27 AM, Ali Abdallah wrote: > > > . . . > > Also, I read on > > > https://lists.freebsd.org/pipermail/freebsd-current/2013-November/046683.html > > someone saying that sysctls to turn off harvesting is documented in > > random(6) > > > It says random(4), so: > > < > https://www.freebsd.org/cgi/man.cgi?query=random&sektion=4&manpath=freebsd-release-ports > >. > > > . . . > > === > Mark Millard > marklmi at yahoo.com > ( dsl-only.net went > away in early 2018-Mar) > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" > I can confirm this is happening. It's easily reproducible: dd if=/dev/urandom of=/dev/null rand_harvestq eat 100% of one CPU for minutes, in my case the system became unresponsive (it freezes for few seconds). I'm running FreeBSD 12.0-ALPHA2 #14 r337973M -- Danilo. @daniloegea http://people.freebsd.org/~danilo/