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Date: Sat, 17 Mar 2007 13:44:58 +0100 From: Ingo Molnar <mingo@...e.hu> To: jos poortvliet <jos@...nkamer.nl> Cc: Mike Galbraith <efault@....de>, Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: RSDL v0.31 * jos poortvliet <jos@...nkamer.nl> wrote: > Op Saturday 17 March 2007, schreef Ingo Molnar: > > so it is not at all clear to me that RSDL is indeed an improvement, > > if it does not have comparable auto-nice properties. > > Wasn't the point of RSDL to get rid of the auto-nice, because it > caused starvation, unpredictable behaviour and other problems? it doesnt really get rid of it, it replaces it with another mechanism that is fundamentally unfair too. RSDL has _another_, albeit more hidden "auto-nice" behavior: this time expressed not via the plain manipulation of priorities based on the sleep average, but expressed via the quota-depletion flux of tasks over time, fed into a complex dance of rotating priorities - which quota-depletion flux is in essence a sleep average too, just more derived and more hardcoded. or looking at it from another angle, code size: text data bss dec hex filename 15750 24 6008 21782 5516 sched.o.vanilla 15960 360 6336 22656 5880 sched.o.rsdl there's no reduction in complexity, it just moved elsewhere. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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