Date: Sat, 26 Nov 2016 16:01:44 +0100 From: Bertram Scharpf <lists@bertram-scharpf.de> To: freebsd-questions@freebsd.org Subject: Re: Old laptop not able to get enough entropy in FreeBSD 11 Message-ID: <20161126150144.GA65709@becker.bs.l> In-Reply-To: <CALeGphz3dm_u2OTbrzwh1y0eR2rqHDZMtfQFWG3fa6qsw7ijhA@mail.gmail.com> References: <CALeGphz-dL9jwy7=8hN0p7YtmY=ad-dgi7Ee2NqRtuURk%2Bu1ew@mail.gmail.com> <20161109121030.2f678bea@gumby.homeunix.com> <CALeGphx=UBhBmE4X_Q3H%2BwE3Zg=Tki_EWmVAs-728fjuMPzJxw@mail.gmail.com> <CALeGphyfmSCy8dOg-8_JHm=P6o6ucNhV2TsAZGxWMo-PULAAqg@mail.gmail.com> <20161126033259.GA57873@becker.bs.l> <CALeGphz3dm_u2OTbrzwh1y0eR2rqHDZMtfQFWG3fa6qsw7ijhA@mail.gmail.com>
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On Friday, 25. Nov 2016, 20:06:55 -0800, Jack L. wrote: > On Fri, Nov 25, 2016 at 7:32 PM, Bertram Scharpf <lists@bertram-scharpf.de> > wrote: > > > On Friday, 25. Nov 2016, 18:31:24 -0800, Jack L. wrote: > > > >> > I have an old single core AMD Turion ML-37 laptop that has nothing > > > >> > installed. When I boot it up, the moment it displays login:, it hangs > > > >> > until i press some random keys. At shutdown, it will hang until I > > > >> > press keys and it will not move onto the next line of shutdown until > > > >> > I keep pressing keys. > > > >> > > > > >> > If I cat /dev/random > ./dev/null while using the laptop, it works > > > >> > fine but when nothing is happening, the laptop hangs. Any ideas? It's > > > >> > running 11.0-STABLE > > > > > > > > Any ideas on why the laptop would have that behavior in 11? It didn't hang > > > > at all in 10.3-STABLE > > > > > > > I just installed 12-CURRENT on the laptop and it also hangs even at > > > install/boot/shutdown until I hit keys, then it will move as long as I > > > continue to hit keys. I also found that if I ping the laptop, it will > > > respond but in between pings, it will hang. Using FreeBSD 10.3, it works > > > perfectly fine without any random keypresses. Any ideas? > > > > I'm convinced this behaviour it worth being analysed. > > > > Can you gain any knowlegde by calling cat through truss? > > How should I run that? Sorry, that was probably too fast. You could run one of those: # truss cat /dev/random >/dev/null # truss dd if=/dev/random of=/dev/null bs=512 count=3 But they will show just a series of read-write calls until a read will hang. The detain presumably occurs in the random device. That's kernel stuff. Does anybody have a hint how to debug that without influencing the behaviour in question? Bertram -- Bertram Scharpf Stuttgart, Deutschland/Germany http://www.bertram-scharpf.de
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