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Tue, 6 Nov 2018 10:47:26 +0100 (CET) Subject: Re: FreeBSD 11.x thread creation time is 9000+ microseconds on Intel Xeon Gold series CPU To: Steevan Rodrigues , vhaisman@gmail.com Cc: freebsd-hackers@freebsd.org References: <7bb8463e-aa5d-bade-7ae7-6c612bae65f9@gmail.com> From: Guido Falsi Openpgp: preference=signencrypt Autocrypt: addr=mad@madpilot.net; prefer-encrypt=mutual; keydata= xsBNBE+G+l0BCADi/WBQ0aRJfnE7LBPsM0G3m/m3Yx7OPu4iYFvS84xawmRHtCNjWIntsxuX fptkmEo3Rsw816WUrek8dxoUAYdHd+EcpBcnnDzfDH5LW/TZ4gbrFezrHPdRp7wdxi23GN80 qPwHEwXuF0X4Wy5V0OO8B6VT/nA0ADYnBDhXS52HGIJ/GCUjgqJn+phDTdCFLvrSFdmgx4Wl c0W5Z1p5cmDF9l8L/hc959AeyNf7I9dXnjekGM9gVv7UDUYzCifR3U8T0fnfdMmS8NeI9NC+ wuREpRO4lKOkTnj9TtQJRiptlhcHQiAlG1cFqs7EQo57Tqq6cxD1FycZJLuC32bGbgalABEB AAHNHkd1aWRvIEZhbHNpIDxtYWRAbWFkcGlsb3QubmV0PsLAeQQTAQgAIwIbAwIeAQIXgAUL CQgHAwUVCgkICwQWAgMBBQJS79AgAhkBAAoJEBrmhg5Wy9KTc0kH/RO64ORBlTbTHaUaOj8F Je5O5NU2Pt9Cyt5ZWBRvxntr1zPTJGKRPS9ihlIfqT4ZvEngQGp57EUyFbCpI0UWasTerImM tt5WACnGmCzUTB39UXx8Oy4b1EgWeTJQ747e/F1mQLXTNa6ijRBE9fYlTb4gAkPN88/wVV9v 3PZozKLTg16ghBzHM/P7Lk8L7clPEZChX1FTa/6eSt3nvzfCuTMZbBPJF/ph+q1KyPqRgVfh tyhu5dvgMoPz/ni41IfeSrkJTD5RXzdyGR9q4Z1NYeBsLkRjC4LxKAP5KqUsvlOUjKvO1byj ApYdMarol+IGkaSk9e3zVYAJkWKjn/ni8XbOwU0EUxB7QQEQAKFhrDceoPdK/IHDSmoj6SQY isvM7VdhcleS7E9DoEAVt7yMbf6HbbMVTTY6ckvwTWQssywLBXNVqxgc4WLJjzfUhgef+WE7 5M3+WFYlOVQLGZY/zEVgma1raYnOHNAOzeHLDmEXjbZP6vGAeDyBbGfQPpE7qGYZ7ubeT3Xw QO+PklcCrvOPj2ZPcAxGNS2xVU/LzONqCrJqLMJSIcCdsbiSP4G5PnDFHtMokaTY6OEr8OEQ fOAerhcHUa/z7Uu8YtmaqKH+QGkE/WEgaRqSiTnv0JOTD+DxehaqvoKPPZ++2NpCZMHB2i6A /xifmQwEiIjEXtcueBRzkNUQkxhqZyS13SrhocL9ydtaVPBzZatAEjUDDEJmAMLVFs45qfyh MiNapHJo2n3MW/E5omqCvEkDdWX/en3P7CK2TemeaDghMsgkNKax/z0wNo5UZCkOPOz0xpNi UilOVbkuezZZNg65741qee2lfXhQIaZ66yT7hphc/N/z3PIAtLeze4u1VR2EXAuZ2sWAdlKC NTlJMsaU/x70BV11Wd/ypnVzM68dfdQIIAj1iMFAD/lXGlEUmKXg5Ov2VQDlTntQoanCYrAg +8CttPzjrydgLZFq3hrtQmfc0se5yv1WHS69+BsUOG09RvvawUDZxUjW19kyeN9THaNRgow3 kSuArUp6zSmJABEBAAHCwF8EGAEIAAkFAlMQe0ECGwwACgkQGuaGDlbL0pMN5wgA4bCkX/qw EVC06ToeR6C2putmSWQMgpDaqrv65Hubo+QGmg2P4ewTYQQ4g6oYWS03qHxqVVWhKz7FjfrV +dH8qbCLfSgIcvdBha7ayGZVrsiuMLKGbw36fcmkZPpSDOfHcP0XH8Z+u9CWj0xUkTxAlZ/7 i6gYSUpG2JWNtdmE/X8VVEyXusCLwy0K0BI60A/4dRTIX3C4QKrJ3ZbUXegz70ynjHf+lQMZ 9IZKASoRMuS5FozPQh6abvmwZEPdf5I9riUElzvHrqJ8Bx0t3Pujdoth+yNHpnBxrtO8LkQd rQ58P0SwcaIX33T2U9pG8bhu5YVR88FQ8OQ0cEsPBpDncg== Message-ID: Date: Tue, 6 Nov 2018 10:47:26 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: A2E706F30C X-Spamd-Result: default: False [-3.48 / 200.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-0.99)[-0.994,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; R_SPF_ALLOW(-0.20)[+mx]; NEURAL_HAM_LONG(-0.99)[-0.987,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[madpilot.net]; TO_DN_SOME(0.00)[]; RCVD_COUNT_THREE(0.00)[4]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MX_GOOD(-0.01)[eddie.gfratio.it,vogon.madpilot.net]; NEURAL_HAM_SHORT(-0.93)[-0.929,0]; IP_SCORE(-0.26)[ipnet: 159.69.0.0/16(1.53), asn: 24940(-2.81), country: DE(-0.01)]; FREEMAIL_TO(0.00)[gmail.com]; RECEIVED_SPAMHAUS_PBL(0.00)[109.128.16.87.zen.spamhaus.org : 127.0.0.10]; R_DKIM_NA(0.00)[]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:24940, ipnet:159.69.0.0/16, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; FROM_EQ_ENVFROM(0.00)[] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Nov 2018 09:47:39 -0000 On 06/11/18 10:01, Steevan Rodrigues wrote: > Ok. Sorry about that. Again I have attached that test program as a tar > file. I am not sure whether even this gets stripped by mailing list > software. > > Anyway here is the program given below. > I'm not a kernel guy or an expert in such things, but I see that flamegraphs are often used to analyze such issues. It gives an idea where the kernel is actually spending it's time. There's also a port to help with this: https://www.freshports.org/benchmarks/flamegraph/ I think if you could gather such information and make it available you'd make it easier for experts to explain what is happening and maybe also do something about this. -- Guido Falsi