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Tue, 11 Feb 2025 20:20:03 +0000 Message-ID: Date: Tue, 11 Feb 2025 12:20:02 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/17] x86/smpboot: Fix INIT delay optimization for extended Intel Families To: Dave Hansen , , Dave Hansen , Tony Luck CC: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , "Alexander Shishkin" , Jiri Olsa , Ian Rogers , Adrian Hunter , "Kan Liang" , Thomas Gleixner , Borislav Petkov , "H . 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The optimization doesn't extend to the upcoming Family 18/19 >> models. > > This doesn't quite parse correctly to me. > > Let's say it this way: > > Some old crusty CPUs need an extra delay that slows down > booting. See the comment above 'init_udelay' for details. Newer > CPUs don't need the delay. > > Right now, for Intel, Family 6 and only Family 6 skips the > delay. That leaves out both the Family 15 (Pentium 4s) and brand > new Family 18/19 models. > > The omission of Family 15 (Pentium 4s) seems like an oversight > and 18/19 do not need the delay. > > Skip the delay on all Intel processors Family 6 and beyond. > > Is there anything wrong there? No, it is accurate.