Mike Galbraith je napravio patch od 233 linija koda koji ubrzava vreme odziva Linux desktopa u proseku 10 puta.
The patch being talked about is designed to automatically create task groups per TTY in an effort to improve the desktop interactivity under system strain. Mike Galbraith wrote the patch, which is currently in its third version in recent weeks, after Linus Torvalds inspired this idea. In its third form (patch), this patch only adds 224 lines of code to the kernel's scheduler while stripping away nine lines of code, thus only 233 lines of code are in play.
Tests done by Mike show the maximum latency dropping by over ten times and the average latency of the desktop by about 60 times. Linus Torvalds has already heavily praised (in an email) this miracle patch.
Yeah. And I have to say that I'm (very happily) surprised by just how small that patch really ends up being, and how it's not intrusive or ugly either.
I'm also very happy with just what it does to interactive performance. Admittedly, my "testcase" is really trivial (reading email in a web-browser, scrolling around a bit, while doing a "make -j64" on the kernel at the same time), but it's a test-case that is very relevant for me. And it is a _huge_ improvement.
It's an improvement for things like smooth scrolling around, but what I found more interesting was how it seems to really make web pages load a lot faster. Maybe it shouldn't have been surprising, but I always associated that with network performance. But there's clearly enough of a CPU load when loading a new web page that if you have a load average of 50+ at the same time, you _will_ be starved for CPU in the loading process, and probably won't get all the http requests out quickly enough.
So I think this is firmly one of those "real improvement" patches. Good job. Group scheduling goes from "useful for some specific server loads" to "that's a killer feature".
Linus
Initially a Phoronix reader tipped us off this morning of this latest patch. "Please check this out, my desktop will never be the same again, it makes a *lot* of difference for desktop usage (all things smooth, scrolling etc.)...It feels as good as Con Kolivas's patches."...
izvor:
http://www.phoronix.com/scan.p...icle&item=linux_2637_video