On Sun, Nov 6, 2022 at 5:21 PM Xiangyu Chen <[email protected]> wrote: > > > On 11/1/22 09:48, Xiangyu Chen wrote: > > With the default jitter options aarch64 CPU-based devices typically > > experience continuous > > high CPU utilisation for several minutes after rngd starts. > > > > Accoring to the rng-tools issue #150[1] and comments[2],in order to address > > this, > > the following configuration changes have been made, those configurations > > also can be found on Alpine Linux[3]: > > > > - reduce the number of threads used to 1 in total, rather than 1 per core. > > - reduce the buffer size from 16535 to 4133 which reduces the time taken > > to fill the buffer (and so reduces the duration of CPU load). > > > > [1] https://github.com/nhorman/rng-tools/issues/150 > > [2] https://github.com/nhorman/rng-tools/issues/150#issuecomment-953079212 > > [3] https://git.alpinelinux.org/aports/tree/main/rng-tools/rngd.confd-arm > > > > Signed-off-by: Xiangyu Chen <[email protected]> > > --- > > Changes in V2: > > *put the aarch64 specific default file in > > meta/recipes-support/rng-tools/rng-tools/aarch64 > > Friendly ping. Is there any more concern on this?
My concern is that will it be so for all aarch64 machines ? > > > Thanks, > > Xiangyu > > > --- > > .../rng-tools/rng-tools/aarch64/default | 11 +++++++++++ > > 1 file changed, 11 insertions(+) > > create mode 100644 > > meta/recipes-support/rng-tools/rng-tools/aarch64/default > > > > diff --git a/meta/recipes-support/rng-tools/rng-tools/aarch64/default > > b/meta/recipes-support/rng-tools/rng-tools/aarch64/default > > new file mode 100644 > > index 0000000000..5a2fbcc9ef > > --- /dev/null > > +++ b/meta/recipes-support/rng-tools/rng-tools/aarch64/default > > @@ -0,0 +1,11 @@ > > +# With the default jitter options Arm CPU-based devices typically > > experience > > +# continuous high CPU utilisation for several minutes after rngd starts. > > +# See https://gitlab.alpinelinux.org/alpine/aports/-/issues/13035 and > > +# https://github.com/nhorman/rng-tools/issues/150 > > +# In order to address this the following configuration changes have been > > made: > > +# > > +# - reduce the number of threads used to 1 in total, rather than 1 per > > core. > > +# - reduce the buffer size from 16535 to 4133 which reduces the time > > taken > > +# to fill the buffer (and so reduces the duration of CPU load). > > +# > > +EXTRA_ARGS="-r /dev/hwrng -O jitter:buffer_size:4133 -O > > jitter:refill_thresh:4133 -O jitter:thread_count:1" > > > > > > > > >
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