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Message-ID: <m1hcxdq5oz.fsf@ebiederm.dsl.xmission.com> Date: Sun, 05 Nov 2006 08:22:20 -0700 From: ebiederm@...ssion.com (Eric W. Biederman) To: Adrian Bunk <bunk@...sta.de> Cc: Linus Torvalds <torvalds@...l.org>, Andrew Morton <akpm@...l.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, ak@...e.de, discuss@...-64.org, Tim Chen <tim.c.chen@...ux.intel.com> Subject: Re: 2.6.19-rc4: known unfixed regressions (v3) Adrian Bunk <bunk@...sta.de> writes: > > Subject : x86_64: NR_IRQ increase causes 11.5% slowdown > in lmbench's fork benchmark > References : http://lkml.org/lkml/2006/11/2/192 > Submitter : Tim Chen <tim.c.chen@...ux.intel.com> > Caused-By : Eric W. Biederman <ebiederm@...ssion.com> > commit 550f2299ac8ffaba943cf211380d3a8d3fa75301 > Handled-By : Eric W. Biederman <ebiederm@...ssion.com> > Andi Kleen <ak@...e.de> > Status : problem is being debugged Currently I'm at a loss why the cross cpu fork lm_bench numbers should get worse when you simply double NR_IRQS. As far as I can determine nothing on that code path is directly affected by that change. Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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