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Wed, 29 Jul 2020 12:54:21 +0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 06TCsJpU26476990 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 29 Jul 2020 12:54:19 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 65F37A4054; Wed, 29 Jul 2020 12:54:19 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CE750A4067; Wed, 29 Jul 2020 12:54:08 +0000 (GMT) Received: from satheesh (unknown [9.85.69.130]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Wed, 29 Jul 2020 12:54:08 +0000 (GMT) Date: Wed, 29 Jul 2020 18:24:02 +0530 From: Satheesh Rajendran To: Srikar Dronamraju Subject: Re: [PATCH 0/7] Optimization to improve cpu online/offline on Powerpc Message-ID: <20200729125402.GA65853@satheesh> References: <20200727075532.30058-1-srikar@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200727075532.30058-1-srikar@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-07-29_04:2020-07-29, 2020-07-29 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxscore=0 clxscore=1011 phishscore=0 malwarescore=0 impostorscore=0 adultscore=0 bulkscore=0 spamscore=0 suspectscore=2 mlxlogscore=999 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007290080 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Satheesh Rajendran Cc: Nathan Lynch , Gautham R Shenoy , Michael Neuling , Peter Zijlstra , LKML , Nicholas Piggin , Valentin Schneider , Oliver O'Halloran , Satheesh Rajendran , linuxppc-dev , Ingo Molnar Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, Jul 27, 2020 at 01:25:25PM +0530, Srikar Dronamraju wrote: > Anton reported that his 4096 cpu (1024 cores in a socket) was taking too > long to boot. He also analyzed that most of the time was being spent on > updating cpu_core_mask. > > Here are some optimizations and fixes to make ppc64_cpu --smt=8/ppc64_cpu > --smt=1 run faster and hence boot the kernel also faster. > > Its based on top of my v4 coregroup support patchset. > http://lore.kernel.org/lkml/20200727053230.19753-1-srikar@linux.vnet.ibm.com/t/#u > > The first two patches should solve Anton's immediate problem. > On the unofficial patches, Anton reported that the boot time came from 30 > mins to 6 seconds. (Basically a high core count in a single socket > configuration). Satheesh also reported similar numbers. > > The rest are simple cleanups/optimizations. > > Since cpu_core_mask is an exported symbol for a long duration, lets retain > as a snapshot of cpumask_of_node. boot tested on P9 KVM guest. without this series: # dmesg|grep smp [ 0.066624] smp: Bringing up secondary CPUs ... [ 347.521264] smp: Brought up 1 node, 2048 CPUs with this series: # dmesg|grep smp [ 0.067744] smp: Bringing up secondary CPUs ... [ 5.416910] smp: Brought up 1 node, 2048 CPUs Tested-by: Satheesh Rajendran Regards, -Satheesh > > Architecture: ppc64le > Byte Order: Little Endian > CPU(s): 160 > On-line CPU(s) list: 0-159 > Thread(s) per core: 4 > Core(s) per socket: 20 > Socket(s): 2 > NUMA node(s): 2 > Model: 2.2 (pvr 004e 1202) > Model name: POWER9, altivec supported > CPU max MHz: 3800.0000 > CPU min MHz: 2166.0000 > L1d cache: 32K > L1i cache: 32K > L2 cache: 512K > L3 cache: 10240K > NUMA node0 CPU(s): 0-79 > NUMA node8 CPU(s): 80-159 > > without patch (powerpc/next) > [ 0.099347] smp: Bringing up secondary CPUs ... > [ 0.832513] smp: Brought up 2 nodes, 160 CPUs > > with powerpc/next + coregroup support patchset > [ 0.099241] smp: Bringing up secondary CPUs ... > [ 0.835627] smp: Brought up 2 nodes, 160 CPUs > > with powerpc/next + coregroup + this patchset > [ 0.097232] smp: Bringing up secondary CPUs ... > [ 0.528457] smp: Brought up 2 nodes, 160 CPUs > > x ppc64_cpu --smt=1 > + ppc64_cpu --smt=4 > > without patch > N Min Max Median Avg Stddev > x 100 11.82 17.06 14.01 14.05 1.2665247 > + 100 12.25 16.59 13.86 14.1143 1.164293 > > with patch > N Min Max Median Avg Stddev > x 100 12.68 16.15 14.24 14.238 0.75489246 > + 100 12.93 15.85 14.35 14.2897 0.60041813 > > Cc: linuxppc-dev > Cc: LKML > Cc: Michael Ellerman > Cc: Nicholas Piggin > Cc: Anton Blanchard > Cc: Oliver O'Halloran > Cc: Nathan Lynch > Cc: Michael Neuling > Cc: Gautham R Shenoy > Cc: Satheesh Rajendran > Cc: Ingo Molnar > Cc: Peter Zijlstra > Cc: Valentin Schneider > > Srikar Dronamraju (7): > powerpc/topology: Update topology_core_cpumask > powerpc/smp: Stop updating cpu_core_mask > powerpc/smp: Remove get_physical_package_id > powerpc/smp: Optimize remove_cpu_from_masks > powerpc/smp: Limit cpus traversed to within a node. > powerpc/smp: Stop passing mask to update_mask_by_l2 > powerpc/smp: Depend on cpu_l1_cache_map when adding cpus > > arch/powerpc/include/asm/smp.h | 5 -- > arch/powerpc/include/asm/topology.h | 7 +-- > arch/powerpc/kernel/smp.c | 79 +++++++++-------------------- > 3 files changed, 24 insertions(+), 67 deletions(-) > > -- > 2.17.1 >