From: Oliver Xymoron <oxymoron@waste.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linus Torvalds <torvalds@transmeta.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] (0/4) Entropy accounting fixes
Date: Sun, 18 Aug 2002 10:08:31 -0500 [thread overview]
Message-ID: <20020818150830.GR21643@waste.org> (raw)
In-Reply-To: <1029666605.15858.9.camel@irongate.swansea.linux.org.uk>
On Sun, Aug 18, 2002 at 11:30:05AM +0100, Alan Cox wrote:
>
> Its probably true there are low bits of randomness available from such
> sources providing we know the machine has a tsc, unless the I/O APIC is
> clocked at a divider of the processor clock in which case our current
> behaviour is probably much saner.
I actually looked at this a bit for embedded applications - there's a
technique for pulling entropy from free-running clock skew.
Unfortunately with modern chipsets, just about all clocks are
generated from a single source these days. This is even true in the
non-x86 world now. Any extra clocks you have are likely to be out in
peripheral-land and too slow (serial port) or too inaccessible (VGA
dot clocks) to be interesting.
> With modern systems that have real RNG's its a non issue.
Thankfully.
--
"Love the dolphins," she advised him. "Write by W.A.S.T.E.."
next prev parent reply other threads:[~2002-08-18 15:04 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-18 2:15 [PATCH] (0/4) Entropy accounting fixes Oliver Xymoron
2002-08-18 2:23 ` [PATCH] (1/4) " Oliver Xymoron
2002-08-18 2:26 ` [PATCH] (2/4) Update input drivers Oliver Xymoron
2002-08-18 2:29 ` [PATCH] (3/4) SA_RANDOM user fixup Oliver Xymoron
2002-08-18 2:32 ` [PATCH] (4/4) entropy batching update Oliver Xymoron
2002-08-18 2:30 ` [PATCH] (0/4) Entropy accounting fixes Linus Torvalds
2002-08-18 2:59 ` Oliver Xymoron
2002-08-18 3:08 ` Linus Torvalds
2002-08-18 3:25 ` Linus Torvalds
2002-08-18 4:42 ` Oliver Xymoron
2002-08-18 4:53 ` Linus Torvalds
2002-08-18 5:05 ` Dmitri
2002-08-18 6:18 ` Oliver Xymoron
2002-08-22 3:33 ` David Wagner
2002-08-18 10:30 ` Alan Cox
2002-08-18 15:08 ` Oliver Xymoron [this message]
2002-08-18 17:31 ` Jonathan Lundell
2002-08-22 3:27 ` David Wagner
2002-08-18 4:30 ` Oliver Xymoron
2002-08-21 8:44 ` Rogier Wolff
2002-08-21 12:47 ` Oliver Xymoron
2002-08-18 5:28 ` Andreas Dilger
2002-08-18 5:53 ` Oliver Xymoron
2002-08-22 3:25 ` David Wagner
2002-08-18 3:05 ` Linus Torvalds
2002-08-18 3:51 ` Robert Love
2002-08-18 4:01 ` Linus Torvalds
2002-08-18 5:38 ` Oliver Xymoron
2002-08-19 4:21 ` Theodore Ts'o
2002-08-19 10:15 ` Marco Colombo
2002-08-19 10:25 ` Oliver Neukum
2002-08-19 11:03 ` Marco Colombo
2002-08-19 14:22 ` Oliver Neukum
2002-08-19 15:21 ` Marco Colombo
2002-08-19 16:29 ` Oliver Neukum
2002-08-19 12:39 ` Oliver Xymoron
2002-08-18 6:31 ` Robert Love
2002-08-18 6:48 ` Oliver Xymoron
2002-08-18 4:06 ` dean gaudet
2002-08-18 4:44 ` Oliver Xymoron
2002-08-18 7:31 ` Bernd Eckenfels
2002-08-18 9:48 ` Ralf Baechle
2002-08-20 12:51 ` Bernd Eckenfels
2002-08-18 16:58 ` Robert Love
2002-08-18 10:25 ` Alan Cox
2002-08-19 10:47 ` Marco Colombo
2002-08-19 12:29 ` Alan Cox
2002-08-19 12:56 ` Marco Colombo
2002-09-08 3:43 ` D. Hugh Redelmeier
2002-09-08 18:03 ` David Wagner
2002-09-09 16:53 ` Oliver Xymoron
2002-09-09 16:58 ` David Wagner
2002-09-09 19:47 ` Oliver Xymoron
2002-09-09 23:22 ` David Wagner
2002-09-16 22:51 ` dean gaudet
2002-09-17 1:18 ` Oliver Xymoron
2002-09-09 18:54 ` Kent Borg
2002-09-09 19:57 ` Oliver Xymoron
2002-09-09 20:11 ` Kent Borg
2002-08-18 4:57 ` Oliver Xymoron
2002-08-18 4:28 ` Oliver Xymoron
2002-08-18 4:51 ` Linus Torvalds
2002-08-18 5:24 ` Oliver Xymoron
2002-08-18 16:59 ` Linus Torvalds
2001-11-02 10:34 ` Pavel Machek
2002-08-23 20:16 ` Linus Torvalds
2002-08-18 17:03 ` Robert Love
2002-08-18 17:31 ` Oliver Xymoron
2002-08-18 16:54 ` Robert Love
2002-08-18 17:18 ` Oliver Xymoron
2002-08-18 17:20 ` Robert Love
2002-08-19 5:43 ` Theodore Ts'o
2001-11-02 10:05 ` Pavel Machek
2002-08-19 6:06 ` *Challenge* Finding a solution (When kernel boots it does not display any system info) louie miranda
2002-08-19 7:30 ` Gilad Ben-Yossef
2002-08-19 7:30 ` Ryan Cumming
2002-08-20 0:55 ` louie miranda
2002-08-19 13:52 ` [PATCH] (0/4) Entropy accounting fixes Oliver Xymoron
2002-08-20 8:59 ` Tommi Kyntola
2002-08-20 13:21 ` Oliver Xymoron
2002-08-20 16:19 ` Tommi Kyntola
2002-08-20 17:22 ` Oliver Xymoron
2002-09-08 3:51 ` D. Hugh Redelmeier
2002-09-08 4:31 ` Oliver Xymoron
-- strict thread matches above, loose matches on Subject: below --
2002-08-18 4:57 David Brownell
2002-08-18 6:02 ` Oliver Xymoron
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20020818150830.GR21643@waste.org \
--to=oxymoron@waste.org \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=torvalds@transmeta.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox