linux-kernel - RE: [PATCH v2 7/7] x86/resctrl: Determine if Sub-NUMA Cluster is enabled and initialize.

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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