linux-kernel - Re: time accounting problem (powerpc only?)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1196168780.6058.2.camel@johannes.berg>
Date:	Tue, 27 Nov 2007 14:06:20 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linuxppc-dev list <linuxppc-dev@...abs.org>
Subject: Re: time accounting problem (powerpc only?)


On Tue, 2007-11-27 at 20:57 +1100, Paul Mackerras wrote:
> Johannes Berg writes:
> 
> > Contrary to what I claimed later in the thread, my 64-bit powerpc box
> > (quad-core G5) doesn't suffer from this problem.
> > 
> > Does anybody have any idea? I don't even know how to debug it further.
> 
> I see it on my G4 powerbook.  However, a compute-bound task runs just
> as fast (i.e. completes in the same elapsed time) as on older kernels,
> so it does look like it is just an accounting problem.  If the CPU was
> really spending more than half its time servicing hardware interrupts,
> the task should take more than twice as long to complete.

Exactly. So where do I look for the accounting bug?

johannes

Download attachment "signature.asc" of type "application/pgp-signature" (829 bytes)