From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 Date: Thu, 20 Nov 2008 01:06:06 -0800 (PST) Message-ID: <20081120.010606.67799718.davem@davemloft.net> References: <20081117.125826.193693115.davem@davemloft.net> <200811182044.11055.nickpiggin@yahoo.com.au> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200811182044.11055.nickpiggin-/E1597aS9LT0CCvOHzKKcA@public.gmane.org> Sender: kernel-testers-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: Text/Plain; charset="us-ascii" To: nickpiggin-/E1597aS9LT0CCvOHzKKcA@public.gmane.org Cc: torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, 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 From: Nick Piggin Date: Tue, 18 Nov 2008 20:44:10 +1100 > On Tuesday 18 November 2008 07:58, David Miller wrote: > > From: Linus Torvalds > > Date: Mon, 17 Nov 2008 12:30:00 -0800 (PST) > > > > > On Mon, 17 Nov 2008, David Miller wrote: > > > > It's on my workstation which is a much simpler 2 processor > > > > UltraSPARC-IIIi (1.5Ghz) system. > > > > > > Ok. It could easily be something like a cache footprint issue. And while > > > I don't know my sparc cpu's very well, I think the Ultrasparc-IIIi is > > > super- scalar but does no out-of-order and speculation, no? > > > > I does only very simple speculation, but you're description is accurate. > > Surely it would do branch prediction, but maybe not indirect branch? Right.