On Tue, Dec 13, 2011 at 10:52 PM, Dave Taht wrote: > One both good and horrible thing I did back in june... > > http://lists.noise.gatech.edu/pipermail/bismark-devel/2011-July/000251.html > > was to swap the default gui from xwrt to luci. Good, in that that GUI > keeps getting better and better. Bad, because neither jim, nor I, know lua > the language at all, and can't add features nor fix gui issues. > > I've learned a lot of languages in my life, but can write shell and C and > SQL in my sleep. In olden days I could count LISP among those, too, and a > dozen others, but not of late. > > Recently I shot myself in the foot, trying to scale kleinrock up and down > by doing a simple lookup table for 'sqrt' for various amounts of flows in > the various AQM attempts I have going using 'tc' in the deBloat.git repo. > The numbers were so off from correct, that I realized that I really needed > to take a sqrt directly... > > and the only way to do that (or so I thought) was to write a shell script > wrapper around 'bc'... > > and to get bc, I needed to compile and install it on cerowrt. > > Not only that, but the shell script was horribly slow, taking 2 minutes in > one version, to create the tc rules. I rewrote it in C, cutting that time > down to 6 ms (and getting my !@! sqrt function for free), but that lacks > the run time flexibility of an interpreter. > > Then I realized that lua could do the job... > > lua -e "print(math.sqrt(12))" > > and then I realized, why not try writing the AQM stuff entirely in lua and > see if I got a good compromise between shell and C. > > and finally be able to do gui stuff, eventually. > > It's an odd way to bite the bullet and decide to try to learn a new > language, but, there it is. > translated the c into lua (t minus whenever I sent this message) time ./htb-bt-qfq-red-4mbit > /dev/null real 0m1.762s user 0m0.180s sys 0m0.330s d@cruithne:~/git/deBloat/src$ time ./a.out > /dev/null real 0m0.025s user 0m0.020s sys 0m0.000s d@cruithne:~/git/deBloat/src$ time ./test.lua > /dev/null real 0m0.090s user 0m0.083s sys 0m0.007s Moving to lua, I think, is wise. > > > -- > Dave Täht > SKYPE: davetaht > US Tel: 1-239-829-5608 > FR Tel: 0638645374 > http://www.bufferbloat.net > -- Dave Täht SKYPE: davetaht US Tel: 1-239-829-5608 FR Tel: 0638645374 http://www.bufferbloat.net