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Subject: [Bug 207022] stat() 4 to 16 times slower on FreeBSD/UFS than on
 Linux/Ext4
Date: Tue, 09 Feb 2016 14:52:08 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D207022

--- Comment #7 from Fabiano Sidler <fabianosidler@swissonline.ch> ---
Following http://www.brendangregg.com/blog/2015-03-10/freebsd-flame-graphs.=
html
I've done this:
dtrace -x stackframes=3D100 -n 'profile-197 /arg0/ { @[stack()] =3D count()=
; }' -c
./cstat -o out.stacks
./stackcollapse.pl out.stacks | ./flamegraph.pl > out.svg
uploaded to http://imgh.us/out_4.svg

=3D=3D=3D snip out.stacks =3D=3D=3D


              kernel`cache_lookup+0x21c
              kernel`namei+0x4d4
              kernel`kern_statat_vnhook+0xae
              kernel`sys_stat+0x2d
              kernel`amd64_syscall+0x357
              kernel`0xffffffff80d30a8b
                1

              kernel`cache_lookup+0x53f
              kernel`namei+0x4d4
              kernel`kern_statat_vnhook+0xae
              kernel`sys_stat+0x2d
              kernel`amd64_syscall+0x357
              kernel`0xffffffff80d30a8b
                1

              kernel`acpi_cpu_c1+0x6
              kernel`sched_idletd+0x1d5
              kernel`fork_exit+0x9a
              kernel`0xffffffff80d30cde
               14
=3D=3D=3D snap out.stacks =3D=3D=3D

I don't see anything helpful in it, but maybe someone else does?

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