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List:       freebsd-questions
Subject:    Re: Old laptop not able to get enough entropy in FreeBSD 11
From:       "Jack L." <xxjack12xx () gmail ! com>
Date:       2016-11-30 1:43:28
Message-ID: CALeGphw4yUAjf4QJuzEXAW7XgweVt36=u8DivCOi982HztuJuw () mail ! gmail ! com
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Adding FreeBSD stable to see if they can provide some insight on this since
it affects everything from 11 and beyond

>
> On Sat, Nov 26, 2016 at 7:01 AM, Bertram Scharpf <lists@bertram-scharpf.de
> > wrote:
>
>> 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?
>>
>
> So truss cat /dev/random >/dev/null
> will keep going and going and going and going
> truss dd if=/dev/random of=/dev/null bs=512 count=3
> sits there and hangs with no activity until i hit a key, then the dd
> happens.
>
>
>> Bertram
>>
>>
>> --
>> Bertram Scharpf
>> Stuttgart, Deutschland/Germany
>> http://www.bertram-scharpf.de
>> _______________________________________________
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>>
>
>
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