[RE: [linux-yocto] [PATCH 4/5] x86-64: use the defaults for number of CPUs] On
30/11/2023 (Thu 20:12) Liu, Yongxin wrote:
> > -----Original Message-----
> > From: linux-yocto@lists.yoctoproject.org <linux-
> > yo...@lists.yoctoproject.org> On Behalf Of Paul Gortmaker via
> > lists.yoctoproject.org
> > Sent: Friday, December 1, 2023 03:08
> > To: Bruce Ashfield <bruce.ashfi...@gmail.com>
> > Cc: linux-yocto@lists.yoctoproject.org
> > Subject: [linux-yocto] [PATCH 4/5] x86-64: use the defaults for number of
> > CPUs
> >
> > From: Paul Gortmaker <paul.gortma...@windriver.com>
> >
> > The x86-64 BSP isn't quite the same as the "more specific" BSP like a
> > Beaglebone Black or the (now deleted) Edgerouter. Where we have exact
> > hardware specifics for boards like those, the x86-64 BSP is more of a
> > "generic" thing used as the baseline across an endless sea of boards.
> >
> > To that end, this is somewhat a revert of commit bd77e1f904f6
> > ("bsp/intel-x86: change the supported maximum number of CPUs to 512 in 64-
> > bit bsp")
> >
> > It is great that a handful of people out there are using Yocto on these
> > huge server machines, but that doesn't reflect 99% of the rest of us who
> > continue to lean towards the original "embedded theme" of Yocto.
> >
> > That means a whole bunch of extra per-CPU jumping through hoops; some can
> > be mitigated by booting with "nr_cpus=4" (or whatever the core count
> > is) but I guarantee largely nobody out there is doing that.
> >
> > Let those users with the crazy CPU count own that config customization
> > locally. The default is 64 which still seems way too large IMHO, but at
> > least we are moving in the right direction.
>
>
> This intel-x86-64 BSP is a generic one used from mobile to server.
>
> Customers need to customize not only the CPU number config but also other
> configs,
> like, removing unused drivers or adding debug options.
> From this point of view, there is no difference between 64 or 512.
So you've basically argued my case for me. If changes are inevitable,
then why do we change the default?
> But it changes the "rule" that intel-x86-64 works for all supported platforms.
> We need to do extra work for servers with large CPU number.
No. There is no "rule" in Yocto like that. That is nonsense because
there is no way Yocto can commit to "support" all the crazy different
x86-64 variants out there.
If a re-seller/integrator wants to take Yocto and tune it for platform
XYZ because there is customer demand and claim it is then "supported" by
them, then fine. But then to expect the Yocto project to own that? No.
Paul.
--
>
> Thanks,
> Yongxin
>
> >
> > Signed-off-by: Paul Gortmaker <paul.gortma...@windriver.com>
> > ---
> > bsp/intel-x86/intel-x86-64.cfg | 3 ---
> > 1 file changed, 3 deletions(-)
> >
> > diff --git a/bsp/intel-x86/intel-x86-64.cfg b/bsp/intel-x86/intel-x86-
> > 64.cfg index 58b0fed637e8..da9bc7b57eca 100644
> > --- a/bsp/intel-x86/intel-x86-64.cfg
> > +++ b/bsp/intel-x86/intel-x86-64.cfg
> > @@ -31,6 +31,3 @@ CONFIG_CRYPTO_DEV_QAT_DH895xCCVF=m
> >
> > # x86 CPU resource control support
> > CONFIG_X86_CPU_RESCTRL=y
> > -
> > -# Processor type and features
> > -CONFIG_NR_CPUS=512
> > --
> > 2.40.0
>
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