From mboxrd@z Thu Jan 1 00:00:00 1970 From: Petr Vorel Date: Tue, 13 Apr 2021 15:57:41 +0200 Subject: [LTP] [PATCH] read_all: limit per cpu nodes to first ten cpus In-Reply-To: References: Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ltp@lists.linux.it Hi Jan, > Some per cpu sysfs entries have high lock contention and when > this is combined with systems which have many CPUs (meaning they > also have many per cpu sysfs entries) the test spends most of > time on these nodes and occasionally also hits timeout. > For example, these entries are largest contributor on HPE Apollo 70 > (aarch64, 256 CPUs): > /sys/kernel/tracing/per_cpu/cpu247/* > /sys/devices/system/cpu/cpu239/acpi_cppc/* Acked-by: Petr Vorel Kind regards, Petr