[Bug 233395] In FreeBSD 11.x contigfree takes too much time on Xeon Gold 5115 CPU

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233395

--- Comment #1 from Steevan <steevanxperia at gmail.com> ---


I tried contacting SuperMicro and then Intel tech support. Both suggested that
the issue could be specific to FreeBSD OS. 

So later I tried FreeBSD 12 Beta 3 version  on this server with Xeon Gold 5115
CPU.

All these problems have disappeared.  In this FreeBSD 12 Beta3 also contigfree
takes much more time compared to contigmalloc. 

However  when I compare the absolute values to FreeBSD 11.x number I can see
huge improvement in FreeBSD 12 Beta 3.

Now in FreeBSD 12 Beta3 my PCIe card driver takes just a few seconds to load
and few seconds to unload. 
However on FreeBSD 11.x it takes 2+ minutes to load and upto 15 minutes to
unload. 

Hence it looks like the problem is with FreeBSD 11.x. 
Hope the attached simple program in original bug report helps you guys to
reproduce this issue. 

Best Regards,
Steevan

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