From: jak@rudolph.ccur.com (Joe Korty)
Message-Id: <200203152126.VAA27719@rudolph.ccur.com>
Subject: Re: [PATCH] 2.4.18 scheduler bugs
To: alan@lxorguk.ukuu.org.uk (Alan Cox)
Date: Fri, 15 Mar 2002 16:26:59 -0500 (EST)
Cc: joe.korty@ccur.com, marcelo@conectiva.com.br, mingo@elte.hu,
        alan@lxorguk.ukuu.org.uk, torvalds@transmeta.com,
        linux-kernel@vger.kernel.org
Reply-To: joe.korty@ccur.com (Joe Korty)
In-Reply-To: <E16lzQW-0004j4-00@the-village.bc.nu> from "Alan Cox" at Mar 15, 2002 09:39:52 PM
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org

>> - ksoftirqd() - change daemon nice(2) value from 19 to -19.
>> 
>>     SoftIRQ servicing was less important than the most lowly of batch
>>     tasks.  This patch makes it more important than all but the realtime
>>     tasks.
> 
> Bad idea - the right fix to this is to stop using ksoftirqd so readily
> under load. If it bales after 20 iterations life is good. As shipped life
> is bad.
> 
> Once ksoftirq triggers its because we are seriously overloaded (or without
> fixing its use slightly randomly). In that case we want other stuff to
> do work before we potentially unleash the next flood.

That certainly makes sense.  Thanks.
Joe
-
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/