Date: Sat, 15 Sep 2012 12:30:44 +0100 From: Mark Murray <markm@FreeBSD.org> To: Ben Laurie <benl@freebsd.org> Cc: Arthur Mesh <arthurmesh@gmail.com>, Ian Lepore <freebsd@damnhippie.dyndns.org>, Doug Barton <dougb@freebsd.org>, freebsd-security@freebsd.org, RW <rwmaillists@googlemail.com>, "Bjoern A. Zeeb" <bz@freebsd.org> Subject: Re: svn commit: r239569 - head/etc/rc.d Message-ID: <E1TCqaC-000N93-4k@groundzero.grondar.org> In-Reply-To: <CAG5KPzzeRvWTy_O1GtviLajiD=1N%2BuBLFq1WwoAv0A5F_i5puQ@mail.gmail.com> References: <50453686.9090100@FreeBSD.org> <20120911082309.GD72584@dragon.NUXI.org> <504F0687.7020309@FreeBSD.org> <201209121628.18088.jhb@freebsd.org> <5050F477.8060409@FreeBSD.org> <20120912213141.GI14077@x96.org> <20120913052431.GA15052@dragon.NUXI.org> <alpine.BSF.2.00.1209131258210.13080@ai.fobar.qr> <alpine.BSF.2.00.1209141336170.13080@ai.fobar.qr> <E1TCXN0-000NFT-7I@groundzero.grondar.org> <CAG5KPzwOdCkybj3D5uic1KC-pwW-pewgsrqrXg60f5SJjtzYPw@mail.gmail.com> <E1TCbDG-0002Hz-9D@groundzero.grondar.org> <CAG5KPzzRxzVX-%2B9fYjRdqjY-wScbM6AA7GYtLmktgMG0Zg8iyQ@mail.gmail.com> <E1TCbSz-0007CJ-BI@groundzero.grondar.org> <CAG5KPzyJNmXRfxtPPrdc2zVCsxGtDfJT79YC3a1PNUfOOSzt8A@mail.gmail.com> <E1TCcIq-000Brr-Ex@groundzero.grondar.org> <CAG5KPzwEESg7iUb2%2B-kAN%2Bk55M95BZjh5VaSvxzSsSCVuZ9kMw@mail.gmail.com> <E1TCdlD-000C1N-4g@groundzero.grondar.org> <CAG5KPzzFO1H5Wcx34oXi09=aJqg5w%2BXWSd8fnn0Byvpy_8%2B-rA@mail.gmail.com> <E1TCpk1-000N2H-Vq@groundzero.grondar.org> <CAG5KPzzeRvWTy_O1GtviLajiD=1N%2BuBLFq1W woAv0A5F_i5puQ@mail.gmail.com>
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Ben Laurie writes: > > Reseeds are expensive in kernel space; locking/unlocking and thread > > consumption are the issue. Right now, this is mitigated by reseeding > > at 10Hz. To allow reseeds to overwhelm the running kernel by pumping > > data into /dev/random is would be very silly indeed, and I'm not > > going to let that happen. > > I'm curious what the comparative cost of > > cat /dev/zero > /dev/null > > is? > > Or, > > cat /dev/zero > somefile 10+ years ago, on a different continent, I had this data. 1 burglary and one intercontinental relocation later, and I don't have it any more. Recreating is something I'll likely get to, but DHYB. M -- Mark R V Murray Pi: 132511160
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