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Date: Fri, 01 Jul 2022 16:30:07 +0300 From: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com> To: Jon Kohler <jon@...anix.com>, Jacob Pan <jacob.jun.pan@...ux.intel.com>, Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] intel_idle: add CPUIDLE_FLAG_IRQ_ENABLE to SPR C1 and C1E Hi Jon, On Thu, 2022-06-30 at 15:43 -0400, Jon Kohler wrote: > Add CPUIDLE_FLAG_IRQ_ENABLE to spr_cstates C1 and C1E, which will > allow local IRQs to be enabled during fast idle transitions on SPR. Did you have a chance to measure this? When I was doing this for ICX and CLX, I was using cyclictest and wult for measuring IRQ latency. I was planning to do this for SPR as well. > Note: Enabling this for both C1 and C1E is slightly different than > the approach for SKX/ICX, where CPUIDLE_FLAG_IRQ_ENABLE is only > enabled on C1; however, given that SPR target/exit latency is 1/1 > for c1 and 2/4 for C1E, respectively, which is slower than C1 > for SKX, it seems prudent to now enable it on both states. I was also going to measure this for C1E. Could we please hold on this a bit - I'd like to measure this before we merge it. Artem.
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