From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jes Sorensen Date: Wed, 15 Feb 2006 14:56:20 +0000 Subject: Re: [PATCH] ia64: simplify and fix udelay() Message-Id: List-Id: References: <200602150908.k1F98dg02934@unix-os.sc.intel.com> In-Reply-To: <200602150908.k1F98dg02934@unix-os.sc.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "Chen, Kenneth W" Cc: hawkes@sgi.com, Tony Luck , Andrew Morton , linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, Jack Steiner , Robin Holt , Dimitri Sivanich >>>>> "Ken" = Chen, Kenneth W writes: Ken> hawkes@sgi.com wrote on Tuesday, February 14, 2006 10:40 AM >> a preemption and migration to another CPU during the while-loop Ken> Off topic from the subject line a bit, but related: how many Ken> Altix SN2 customers in the field turn on CONFIG_PREEMPT? Redhat Ken> EL4 doesn't turn on preempt, SuSE SLES9 and SLES10 beta don't Ken> turn it on either. Is there a real benefit of turning that Ken> option on for SN2? Ken, Not sure if any do, however as long as it's a supported kernel option then we ought to make sure the kernel is reliable under it. Who knows, at some point some distro might even decide to switch it on as well (as much as I would discourage doing so ;). Cheers, Jes