Messages in this thread | | | Date | Mon, 20 Apr 2015 09:15:56 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 0/1] speeding up cpu_up() |
| |
* Len Brown <lenb@kernel.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
| |