On Wed, Sep 4, 2024 at 1:41 PM Christophe Leroy <christophe.le...@csgroup.eu> wrote: > > Hi, > > I'm done a 'perf record' on vdso_test_random reduced to vdso test only, > and I get the following function usage profile. > > Do you see the same type of percentage on your platforms ? > > I would have expected most of the time to be spent in > __arch_chacha20_blocks_nostack() but that's in fact not the case. > > # Samples: 61K of event 'task-clock:ppp' > # Event count (approx.): 15463500000 > # > # Overhead Command Shared Object Symbol > > # ........ ............... ................... > .................................... > # > 57.74% vdso_test_getra [vdso] [.] __c_kernel_getrandom
Can you run `perf top` to see which instructions are hot? There are some smp barriers in there which might be significant.
