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Re: Emulate Rpi with QEMU fails

From: Alex Bennée
Subject: Re: Emulate Rpi with QEMU fails
Date: Fri, 09 Oct 2020 07:20:43 +0100
User-agent: mu4e 1.5.5; emacs 28.0.50

Thomas <74cmonty@gmail.com> writes:

> Interesting enough is: my top figure reported by perf is like yours:
> Samples: 6M of event 'cycles:u', Event count (approx.): 1936571734942
> Overhead  Command          Shared Object                  Symbol
>    7,95%  qemu-system-arm  qemu-system-arm                [.]
> helper_lookup_tb_ptr                                                        
>    4,16%  qemu-system-arm  qemu-system-arm                [.]
> cpu_get_tb_cpu_state                                                        

Not quite - cpu_get_tb_state should be a fair bit cheaper now since the
optimisations to hflags where introduced.

>    2,52%  qemu-system-arm  libpthread-2.32.so             [.]
> __pthread_mutex_lock                                                        

This indicated there is some lock contention. The QSP profiler can
help here.

Are you running the latest state of master?

Alex Bennée

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