Messages in this thread | | | Date | Sun, 15 Apr 2007 16:39:09 -0700 | From | William Lee Irwin III <> | Subject | Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS] |
| |
On Sun, Apr 15, 2007 at 10:48:24PM +0200, Ingo Molnar wrote: > 2) plugsched did not allow on the fly selection of schedulers, nor did > it allow a per CPU selection of schedulers. IO schedulers you can > change per disk, on the fly, making them much more useful in > practice. Also, IO schedulers (while definitely not being slow!) are > alot less performance sensitive than CPU schedulers.
One of the reasons I never posted my own code is that it never met its own design goals, which absolutely included switching on the fly. I think Peter Williams may have done something about that. It was my hope to be able to do insmod sched_foo.ko until it became clear that the effort it was intended to assist wasn't going to get even the limited hardware access required, at which point I largely stopped working on it.
On Sun, Apr 15, 2007 at 10:48:24PM +0200, Ingo Molnar wrote: > 3) I/O schedulers are pretty damn clean code, and plugsched, at least > the last version i saw of it, didnt come even close.
I'm not sure what happened there. It wasn't a big enough patch to take hits in this area due to getting overwhelmed by the programming burden like some other efforts of mine. Maybe things started getting ugly once on-the-fly switching entered the picture. My guess is that Peter Williams will have to chime in here, since things have diverged enough from my one-time contribution 4 years ago.
-- wli - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |