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Message-ID: <20150420071556.GB14315@gmail.com> Date: Mon, 20 Apr 2015 09:15:56 +0200 From: Ingo Molnar <mingo@...nel.org> To: Len Brown <lenb@...nel.org> Cc: x86@...nel.org, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com> Subject: Re: [PATCH 0/1] speeding up cpu_up() * Len Brown <lenb@...nel.org> wrote: > The following patch... > > [PATCH 1/1] x86: replace cpu_up hard-coded mdelay with variable > > enables reducing cpu_up() time by 10ms on modern systems. > > This means that for every processor in the system, > boot-time and resume-time can be reduced by 10ms per-processor. > > Once this patch is accepted, I'll send a subsequent patch > to update the default delay, as appropriate. > > thanks, > Len Brown, Intel Open Source Technology Center So instead of playing games with an ancient delay, I'd suggest we install the 10 msec INIT assertion wait as a platform quirk instead, and activate it for all CPUs/systems that we think might need it, with a sufficiently robust and future-proof quirk cutoff condition. New systems won't have the quirk active and thus won't have to have this delay configurable either. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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