Date: Wed, 28 Jul 2004 00:27:26 +0300 (EEST)
From: Pasi Sjoholm <ptsjohol@cc.jyu.fi>
To: Robert Olsson <Robert.Olsson@data.slu.se>
cc: Francois Romieu <romieu@fr.zoreil.com>,
        H?ctor Mart?n <hector@marcansoft.com>,
        Linux-Kernel <linux-kernel@vger.kernel.org>, <akpm@osdl.org>,
        <netdev@oss.sgi.com>, <brad@brad-x.com>, <shemminger@osdl.org>
Subject: Re: ksoftirqd uses 99% CPU triggered by network traffic (maybe
 RLT-8139 related)
In-Reply-To: <16646.47585.814327.628319@robur.slu.se>
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On Tue, 27 Jul 2004, Robert Olsson wrote:

>  > Yeah, when the ksoftirqd is taking all the cpu it will be like that, but 
>  > when the kernel is behaving normally the starving diff is between 0->1sec.
>  Well ksoftirqd makes your kernel load just visible which is good and 
>  ksofirqd gets accounted for this when softirq's get deferred to it.
>  It may look like goes from 0 to 100% but thats probably not the case.
>  The problem is we can starve userland at high loads. As said we were
>  trying some way to cure this I may have some old patch if you like to try.

Ok, as I said before I'm willing to test your patches. 

It would be nice that one could use the full capacity of his/her computer.
This is not a big problem for everyday use for a workstation but prevents 
2.6-series to be used in production-enviroments in the servers.
But hey.. we need to do some work and maybe we will resolve this. =)

--
Pasi Sjöholm