Which Directory Service do you use for your network?
None NIS LDAP LDAP + Kerberos Samba Active Directory eDirectory other ( 792 votes ~ 15 comments )
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#7 Re: System encryption on Debian Etch Posted by goeb (84.184.xx.xx) on Wed 30 Aug 2006 at 14:24 I'm currently using it on an 2.4GHz Pentium 4 laptop, and I think all modern systems should be fast enough so you won't see a huge impact on performance. And if you use your laptop for system administration work I assume you should be fine with an encrypted setup. Of course, every data that is read from or written to disk will need some processor time, which may be an issue if you plan to do something like audio/video-encoding or such things. But I have not made any benchmarks, maybe someone reading this can suggest some simple benchmark commands, I'm currently installing a new desktop system which is not yet encrypted, so I can do some before/after tests. I don't know if it's a good test, but maybe it helps: goeb@mobile:~$ time dd if=/dev/zero of=zeros bs=1024k count=1024 real 1m44.114s user 0m0.038s sys 0m12.278s (This was done on an 5400rpm disk, dma enabled. My 2.4GHz CPU (it's no mobile, just a normal desktop Pentium 4) ran most of the test time with 0.9 GHz, some spikes at 2.4GHz (using the ondemand governor it's at 0.3 GHz with no load). Maybe this helps, too: mobile:~# hdparm -tT /dev/hda /dev/hda: Timing cached reads: 544 MB in 2.00 seconds = 271.60 MB/sec Timing buffered disk reads: 54 MB in 3.02 seconds = 17.86 MB/sec So if anyone can tell me if these benchmarks are good enough for a conclusion I will run them on my desktop system to provide some before/after figures. Well, if you are buying a new laptop you can just try it, if it don't work for you it's a simple task to do a reinstall or backup your data, run mke2fs or whatever to "unencrypt" the partitions and copy your data back (basically, there are some more things to do depending on your setup, kernel etc.).
goeb@mobile:~$ time dd if=/dev/zero of=zeros bs=1024k count=1024 real 1m44.114s user 0m0.038s sys 0m12.278s
mobile:~# hdparm -tT /dev/hda /dev/hda: Timing cached reads: 544 MB in 2.00 seconds = 271.60 MB/sec Timing buffered disk reads: 54 MB in 3.02 seconds = 17.86 MB/sec
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