Date: Thu, 22 Nov 2018 05:04:20 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 233395] In FreeBSD 11.x contigfree takes too much time on Xeon Gold 5115 CPU Message-ID: <bug-233395-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D233395 Bug ID: 233395 Summary: In FreeBSD 11.x contigfree takes too much time on Xeon Gold 5115 CPU Product: Base System Version: 11.2-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: steevanxperia@gmail.com Created attachment 199442 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D199442&action= =3Dedit Contains simple kernel module source and a makefile Hi I am seeing a FreeBSD 11.x OS poor performance issue on Xeon Gold CPU. CPU is Intel(R) Xeon(R) Gold 5115 CPU @ 2.40GHz ( dual socket CPU with 10 c= ores per socket ) I have attached a simple kernel module program ( for FreeBSD) and its Makef= ile. This just allocates 32KB contiguous memory using contigmalloc and then fre= es it using contigfree. This repeated 1000 times and time taken by contigmalloc and contigfree is computed . I can see that contigfree takes way too much time . I have another older server running FreeBSD 11.2 Intel(R) Xeon(R) CPU E5-= 2620 v2 @ 2.10GHz (dual socket 6 core per socket and in this I do not see such = an issue . Any idea why contigfree takes so much time on FreeBSD 11.x running on Xeon = Gold 5115 CPU ? It looks like this issue affects only the systems which have more than 16 physical CPU cores. Because of this issue the driver for our PCIe card takes more than 2 minute= s to load and upto 15 minutes to unload.=20 System and CPU details:=20 CPU: Intel(R) Xeon(R) Gold 5115 CPU @ 2.40GHz (2400.07-MHz K8-class CPU) FreeBSD/SMP: Multiprocessor System Detected: 40 CPUs System Information Manufacturer: Supermicro Product Name: Super Server Version: 0123456789 Base Board Information Manufacturer: Supermicro Product Name: X11DPH-Tq Version: 1.01 Regards, Steevan --=20 You are receiving this mail because: You are the assignee for the bug.=
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