Date: Tue, 6 Nov 2018 10:47:26 +0100 From: Guido Falsi <mad@madpilot.net> To: Steevan Rodrigues <steevanxperia@gmail.com>, vhaisman@gmail.com Cc: freebsd-hackers@freebsd.org Subject: Re: FreeBSD 11.x thread creation time is 9000+ microseconds on Intel Xeon Gold series CPU Message-ID: <e5333ed8-9788-41e0-5c75-c72af1525029@madpilot.net> In-Reply-To: <CAKsGTHTLAaPW6P94J_uv%2ByPpOv9FuZZQQjBDYV-vTJUDYZSa%2Bg@mail.gmail.com> References: <CAKsGTHQnaEsqmf_g%2BhH=agmfJ5Z4sZY8qkw1iJWyOF=1e6qm-g@mail.gmail.com> <7bb8463e-aa5d-bade-7ae7-6c612bae65f9@gmail.com> <CAKsGTHTLAaPW6P94J_uv%2ByPpOv9FuZZQQjBDYV-vTJUDYZSa%2Bg@mail.gmail.com>
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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 <mad@madpilot.net>
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