linux-kernel - Re: RSDL v0.31

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Message-Id: <200703192353.19673.a1426z@gawab.com>
Date:	Mon, 19 Mar 2007 23:53:19 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	Mark Lord <lkml@....ca>
Cc:	Mike Galbraith <efault@....de>, Con Kolivas <kernel@...ivas.org>,
	ck@....kolivas.org, Serge Belyshev <belyshev@...ni.sinp.msu.ru>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Nicholas Miell <nmiell@...cast.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: RSDL v0.31

Mark Lord wrote:
> Al Boldi wrote:
> >..
> > Mike, I'm not saying RSDL is perfect, but v0.31 is by far better than
> > mainline.  Try this easy test:
> >
> > startx with the vesa driver
> > run reflect from the mesa5.0-demos
> > load 5 cpu-hogs
> > start moving the mouse
> >
> > On my desktop, mainline completely breaks down, and no nicing may
> > rescue.
> >
> > On RSDL, even without nicing, the desktop is at least useable.
>
> I use a simpler, far more common (for lkml participants) workload:
>
> Dell notebook, single P-M-2GHz, ATI X300, open source X.org:
> (1) build a kernel in one window with "make -j$((NUMBER_OF_CPUS + 1))".
> (2) try to read email and/or surf in Firefox/Thunderbird.
>
> Stock scheduler wins easily, no contest.

Try this on RSDL:

--- sched.bak.c	2007-03-16 23:07:23.000000000 +0300
+++ sched.c	2007-03-19 23:49:40.000000000 +0300
@@ -938,7 +938,11 @@ static void activate_task(struct task_st
 				     (now - p->timestamp) >> 20);
 	}
 
-	p->quota = rr_quota(p);
+	/*
+	 * boost factor hardcoded to 5; adjust to your liking
+	 * higher means more likely to DoS
+	 */
+	p->quota = rr_quota(p) + (((now - p->timestamp) >> 20) * 5);
 	p->prio = effective_prio(p);
 	p->timestamp = now;
 	__activate_task(p, rq);


Thanks!

--
Al

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