看板FB_security
標 題Re: Collecting entropy from device_attach() times.
發信站NCTU CS FreeBSD Server (Tue Oct 2 23:07:03 2012)
轉信站ptt!csnews.cs.nctu!news.cs.nctu!FreeBSD.cs.nctu!freebsd.org!owner-free
Dag-Erling Sm=C3=B8rgrav <
[email protected]> writes:
> If you give me a couple of days, I'll try to come up with a patch that
> collects and stores attach times during boot so we can gather and
> analyse real data.
Here's the data:
http://people.freebsd.org/~des/attachtimes-text.txz
The tarball contains one directory for each machine I collected data
from. Inside each directory is a separate text file for each device in
the system. Each text file contains the attachtime deltas for that
device, one sample per line.
I also included the kernel patch and the source code of the program used
to extract the data.
The total number of experiments is
6250 elitebook
7228 epia1
6803 epia2
4034 thinkpad
13261 virtualbox
37576 total
with a total of 2485193 samples.
Please ignore atkbd0 and atkbdc0, at least for epia1 and epia2, as they
only appear when a keyboard is connected.
I also uploaded a tarball with the raw data:
http://people.freebsd.org/~des/attachtimes-bin.txz
DES
--=20
Dag-Erling Sm=C3=B8rgrav -
[email protected]
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