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=233395 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=199442&action=edit 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 cores per socket ) I have attached a simple kernel module program ( for FreeBSD) and its Makefile. This just allocates 32KB contiguous memory using contigmalloc and then frees 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 minutes to load and upto 15 minutes to unload. System and CPU details: 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 -- You are receiving this mail because: You are the assignee for the bug.
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