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Date: Wed, 19 Aug 2020 02:23:11 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: "Tang, Feng" <feng.tang@...el.com>
CC: Borislav Petkov <bp@...e.de>,
"Chen, Rong A" <rong.a.chen@...el.com>,
LKML <linux-kernel@...r.kernel.org>,
"lkp@...ts.01.org" <lkp@...ts.01.org>
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.
-Tony
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