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Message-ID: <55AD6684.3080607@ezchip.com> Date: Mon, 20 Jul 2015 17:22:12 -0400 From: Chris Metcalf <cmetcalf@...hip.com> To: Frederic Weisbecker <fweisbec@...il.com> CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] nohz: prevent tilegx network driver interrupts On 07/11/2015 10:30 AM, Frederic Weisbecker wrote: > On Fri, Jul 10, 2015 at 03:05:02PM -0400, Chris Metcalf wrote: >> The tilegx chips typically don't do cpu offlining anyway, since >> we've never really found a usecase, so whatever you boot with >> you always have available. We do have support for a bare-metal >> mode which you can run on some of the cores, so you may start >> with fewer than cpu_possible actually running, but it will always >> be that same set of cores. > And that bare metal mode runs out of Linux? The bare metal environment runs on cpus that have been marked as unavailable to Linux, so Linux just sees them as permanently offlined. There is a BME driver (which we haven't upstreamed, since the BME isn't upstreamed either) that arranges to share memory between the BME and Linux. I don't think that many customers are using the BME in any case. We push all of them towards using our dataplane mode instead, since it almost always works just as well from a performance perspective, and is easier to develop code for. -- Chris Metcalf, EZChip Semiconductor http://www.ezchip.com -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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