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Message-ID: <SJ1PR11MB60836CD7493B0EAF0F687051FC22A@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Thu, 22 Jun 2023 16:01:53 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Peter Newman <peternewman@...gle.com>
CC: "Yu, Fenghua" <fenghua.yu@...el.com>,
"Chatre, Reinette" <reinette.chatre@...el.com>,
Jonathan Corbet <corbet@....net>,
"x86@...nel.org" <x86@...nel.org>,
Shaopeng Tan <tan.shaopeng@...itsu.com>,
James Morse <james.morse@....com>,
Jamie Iles <quic_jiles@...cinc.com>,
"Babu Moger" <babu.moger@....com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"patches@...ts.linux.dev" <patches@...ts.linux.dev>,
"Eranian, Stephane" <eranian@...gle.com>
Subject: RE: [PATCH v2 7/7] x86/resctrl: Determine if Sub-NUMA Cluster is
enabled and initialize.
> Unfortunately I'm not getting as good of results with the new series.
> The main difference seems to be updating the 0xca0 MSR instead of
> applying the offset to PQR_ASSOC.
I think I may have reversed the actions to update the MSR in one of
my refactor/rebase. The comment here is correct, but that's not
what the code is doing :-(
Can you swap the bodies of these two functions and retest?
+/*
+ * This MSR provides for configuration of RMIDs on Sub-NUMA Cluster
+ * systems.
+ * Bit0 = 1 (default) For legacy configuration
+ * Bit0 = 0 RMIDs are divided evenly between SNC nodes.
+ */
+#define MSR_RMID_SNC_CONFIG 0xCA0
+
+static void snc_add_pkg(void)
+{
+ u64 msrval;
+
+ rdmsrl(MSR_RMID_SNC_CONFIG, msrval);
+ msrval |= BIT_ULL(0);
+ wrmsrl(MSR_RMID_SNC_CONFIG, msrval);
+}
+
+static void snc_remove_pkg(void)
+{
+ u64 msrval;
+
+ rdmsrl(MSR_RMID_SNC_CONFIG, msrval);
+ msrval &= ~BIT_ULL(0);
+ wrmsrl(MSR_RMID_SNC_CONFIG, msrval);
+}
-Tony
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