Messages in this thread | | | Date | Tue, 11 Aug 2020 09:56:19 +0200 | From | Petr Mladek <> | Subject | Re: [PATCH] init/Kconfig: Fix CPU number in LOG_CPU_MAX_BUF_SHIFT description |
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On Tue 2020-08-11 09:31:45, Paul Menzel wrote: > Currently, LOG_BUF_SHIFT defaults to 17, which is 2 ^ 17 bytes = 128 KB, > and LOG_CPU_MAX_BUF_SHIFT defaults to 12, which is 2 ^ 12 bytes = 4 KB. > > Half of 128 KB is 64 KB, so more than 16 CPUs are required for the value > to be used, as then the sum of contributions is greater than 64 KB for > the first time. My guess is, that the description was written with the > configuration values used in the SUSE in mind. > > Cc: Luis R. Rodriguez <mcgrof@suse.com> > Cc: linux-kernel@vger.kernel.org > Fixes: 23b2899f7f ("printk: allow increasing the ring buffer depending on the number of CPUs") > Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Great catch.
Reviewed-by: Petr Mladek <pmladek@suse.com>
Best Regards, Petr
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