From: Gerd Stolpmann <info@gerd-stolpmann.de>
To: user-mode-linux-devel@lists.sourceforge.net
Subject: [uml-devel] Strange behaviour of hwrng
Date: Fri, 21 Oct 2005 20:24:11 +0200 [thread overview]
Message-ID: <1129919051.27787.42.camel@localhost.localdomain> (raw)
Hi list,
I recently tested the hwrng driver. In principal, it works, but it
sometimes eats up all host CPU time. In particular, I can see that the
UML system does a (blocking) read on /dev/hwrng, and that the host
system loops while reading from /dev/random which almost always returns
-EAGAIN. (Found that out with strace, in the hope the output is
correct.)
Nevertheless rngd seems to work, because when killing with SIGUSR1 it
shows some reasonable statistics.
My test setup is as follows:
- Host system: 2.6.12.6 with SKAS3 v8.2 patch
- UML system: 2.6.14-rc5, in SKAS3 mode.
Using rngd from Debian Sarge.
TLS is disabled.
Let me know if you need more information.
Gerd
--
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Gerd Stolpmann * Viktoriastr. 45 * 64293 Darmstadt * Germany
gerd@gerd-stolpmann.de http://www.gerd-stolpmann.de
Telefon: 06151/153855 Telefax: 06151/997714
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next reply other threads:[~2005-10-21 18:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-21 18:24 Gerd Stolpmann [this message]
2005-10-21 18:42 ` [uml-devel] Strange behaviour of hwrng Blaisorblade
2005-10-21 19:06 ` Gerd Stolpmann
2005-10-22 0:52 ` Blaisorblade
2005-10-22 3:11 ` Jeff Dike
2005-10-22 11:29 ` Blaisorblade
2005-10-22 16:16 ` Gerd Stolpmann
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