BaSzErr - blog:2010:02

17

anonymous@undisclosed.example.com (Anonymous) — Tue, 15 Jun 2021 20:09:02 +0000

2010.02.17 - CPU cache once more

not so long ago i've wrote about CPU chaches on the blog (see article on cache with examples). today i came across interesting, yet short and simple article showing some interesting effects you might encounter. you're encouraged to read gallery of processor cache effects as well.

26

anonymous@undisclosed.example.com (Anonymous) — Tue, 15 Jun 2021 20:09:01 +0000

2010.02.26 - cormageddon

after doing some reading/writing about more cores in CPUs (here come the cores, "free lunch is over") we finally get it in our stores! AMD has officially released Opteron 6000-series with from 8 to 12 cores.

since few days i'm doing a little computing for private purposes any my 4 cores on the server are not enough here. the task is very well scaling between cores (nearly no communication needed) and so increasing from 4 to 12 cores would make work almost 3 times faster. add gigabit ethernet, with channel bondling from 2 cards and we can easily compute on 2-3 such machines at home (36 cores at home would be quite impressive i must say!).

the problem is, as usually with new hardware – the price. it's not totally unaffordable, though 500Euro for the cheapest model (8-cores) up to 1100Euro for the most expensive (12-cores) is a lot, but comparing with the prices of some other solutions one might look for (i.e. Nvidia Tesla) it's really not that bad. probably in a short time intel will release similar CPUs as well and so hardware like this will become more common – so cheaper.

for now - let us wait and see! :)

28

anonymous@undisclosed.example.com (Anonymous) — Tue, 15 Jun 2021 20:09:01 +0000

2010.02.28 - new WPA/TKIP flaw

3 days ago Martin Beck published new attack against WPA/TKIP networks – aka Enhanced TKIP Michael Attacks. TKIP once again shown to be weak, since it's only any improvement and temporary (!) replacement for WEP.

if you have WEP, you don't have security at all. if WPA/TKIP is of your choice, unless you have very short (~100[s]) key switching interval, it can be sniffed and decrypted as well. once again it appeared that only WPA2 does the trick, assuming non-trivial password off course…