linux-kernel - Re: SCHED_FIFO and SCHED

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Message-Id: <1219088775.10800.355.camel@twins>
Date:	Mon, 18 Aug 2008 21:46:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Max Krasnyansky <maxk@...lcomm.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	"Torvalds, Linus" <torvalds@...ux-foundation.org>,
	Stefani Seibold <stefani@...bold.net>,
	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: SCHED_FIFO and SCHED_RR broken by cfs

On Mon, 2008-08-18 at 11:01 -0700, Max Krasnyansky wrote:

> Just wanted to mention that I'm with Nick on this one. I pointed this 
> (ie POSIX breakage) out as soon as the change went in. I do have a valid 
>   (which some people disagree with ;-)) workload that uses 100% of the 
> CPU. So my unit-tests caught this right away.
> 
> Anyway, "RT bandwidth throttling" has been in and enabled be default 
> since 2.6.25. So I'm not sure if it makes sense to revert the default at 
> this point.

Already working on a patches to make it so..

The patch to change the default is simple enough - but I spotted a few
other bugs while poking at the issue Dario pointed out.

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