From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mario Smarduch Date: Fri, 14 Mar 2003 17:21:21 +0000 Subject: [Linux-ia64] Pre-emption patch for IA-64 Message-Id: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Hi, we're trying to build a reliable low-latency system for use in telco call processing carrier grade environments (on rx2600 NEBS like servers) . One of the patches we're heavily relying on is the 'Kernel Preemption' patch. First of we're interested in the (i) status of this patch on IA-64 (ii) any issues that you may have ran into. Our understanding is that the 'Preemption Patch' offers a systematic scheduling checkpoint vs. 'low latency patch' which examines the kernel for any long running code and based on that preemption checks are inserted in the kernel proper only (kernel.org) but addon packages may introduce long latencies. While we plan to run with 1mS clock tick, low latency and the preemption paches, the preemption patch is viewed as a must to gurantee a bound on 'soft-realtime response'. Please point out if these assumption are somewhat correct or is too much emphasis being placed on the preemption patch, the soft-realtime response we're looking for is 1mS. thanks, Mario.