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Date:   Wed, 19 Aug 2020 02:23:11 +0000
From:   "Luck, Tony" <>
To:     "Tang, Feng" <>
CC:     Borislav Petkov <>,
        "Chen, Rong A" <>,
        LKML <>,
        "" <>
Subject: RE: [LKP] Re: [x86/mce] 1de08dccd3: will-it-scale.per_process_ops
 -14.1% regression

	0000000000019260 D pqr_state

Do you have /sys/fs/resctrl mounted?  This variable is read on every context switch.
If your benchmark does a lot of context switching and this now shares a cache line
with something different (especially something that is sometimes modified from another
CPU) that could cause some cache line bouncing.


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