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But I would like a kernel to let boinc (the "nice=19" processes) fill the idle time as much as possible. The current kernel scheduler seems very sensitive to low-nice (higher priority) processes. How can I change this sensitivity? I'm looking at kernel/sched.c, but it's more complicated than a few years ago when I hacked this before :) and that I'm using HT (SMP).. Will you tell me any hint where to modify, and/or what to take care of? or any pointer to proper resources on the Internet? When I use gnome desktop with a system monitor applet, I see there's always some idle part and top also shows the idle time on gnome even if I don't run any specific applications besides system daemons and gnome background processes. However without gnome/X window, top shows no or very small idle power (as a matter of course.) So I want the kernel to be less sensitive. Maybe it will utilize more cpu power. best regards, On 5/19/05, Con Kolivas <kernel@kolivas.org> wrote: > On Thu, 19 May 2005 04:58 pm, Tetsuji "Maverick" Rai wrote: > > On 5/19/05, Con Kolivas <kernel@kolivas.org> wrote: > > > ------------snip--------------- > > > Hyperthread sibling cpus share cpu power. If you let a nice 19 task run > > > full power on the sibling cpu of a nice 0 task it will drain performance > > > from the nice 0 task and make it run approximately 40% slower. The only > > > way around this is to temporarily make the sibling run idle so that a > > > nice 0 task gets the appropriate proportion of cpu resources compared to > > > a nice 19 task. It is intentional and quite unique to the linux cpu > > > scheduler as far as I can tell. On any other scheduler or OS a nice 19 > > > "background" task will make your machine run much slower. > > > > > Thanks. I understood it's a feature of linux kernel and am satisfied > > with it. Actually on Windows xp my application sometimes slows down > > maybe due to inpropoer scheduler. > > Well I invented it so it's very unlikely that Windows* will have it (?yet) :D > > Cheers, > Con > -- Luckiest in the world / Weapon of Mass Distraction http://maverick6664.bravehost.com/ Aviation Jokes: http://www.geocities.com/tetsuji_rai/ Background: http://maverick.ns1.name/ - 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/ | ||||||||||||
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