From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Torvalds Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 Date: Mon, 17 Nov 2008 11:55:35 -0800 (PST) Message-ID: References: <20081117182320.GA26844@elte.hu> <20081117184951.GA5585@elte.hu> <20081117.113936.81699150.davem@davemloft.net> Mime-Version: 1.0 Return-path: In-Reply-To: <20081117.113936.81699150.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org> Sender: kernel-testers-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: TEXT/PLAIN; charset="us-ascii" Content-Transfer-Encoding: 7bit To: David Miller Cc: mingo-X9Un+BFzKDI@public.gmane.org, dada1-fPLkHRcR87vqlBn2x/YWAg@public.gmane.org, rjw-KKrjLPT3xs0@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cl-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, efault-Mmb7MZpHnFY@public.gmane.org, a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org, shemminger-ZtmgI6mnKB3QT0dZR+AlfA@public.gmane.org On Mon, 17 Nov 2008, David Miller wrote: > > Again, do a non-NMI profile and the top (at least for me) > looks like this: Can _you_ please do a NMI profile and see what your real problem is? I can't imagine that Niagara (or whatever) is so weak that it can't do NMI's. The fact is, David, that Ingo just posted a profile that was _better_ than anything you have ever posted, and it doesn't show what you complain about. So he's not seeing it. Asking him to do a _stupid_ profile is just that: stupid. So try to figure out why his (better) profile doesn't match your (inferior) one, instead of asking him to do stupid things. It's some difference in architectures, likely: maybe the sparc timekeeping is crap, maybe it's a cache issue and sparc caches are crap, maybe it's something where Niagara (is it niagara) has some oddness that shows up because it has that odd four-threads+four-cores or whatever. Linus