Messages in this thread | | | Date | Mon, 4 May 2015 17:45:17 -0500 | From | Aravind Gopalakrishnan <> | Subject | Re: [PATCH 0/1] speeding up cpu_up() |
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On 5/3/2015 11:13 AM, Aravind Gopalakrishnan wrote: > > On 5/1/15 7:42 PM, Aravind Gopalakrishnan wrote: >> >> On 5/1/15 5:47 PM, Borislav Petkov wrote: >>> Aravind and I could probably test on a couple of AMD boxes to narrow >>> down. >>> >>> @Aravind, see here: >>> >>> https://lkml.kernel.org/r/87d69aab88c14d65ae1e7be55050d1b689b59b4b.1429402494.git.len.brown@intel.com >>> >>> >>> You could ask around whether a timeout is needed between the assertion >>> and deassertion of INIT done by the BSP when booting other cores. >> >> Sure, I'll ask around and try mdelay(0) on some systems as well. >> I can gather Fam15h, Fam16h but don't have K8's or older. >> >> Will let you know how it goes. > Update: > Fam15h Model00h-0fh, Fam15hModel60h and Fam16h Model 00h-0fh > processors boot fine with mdelay(0) and BSP brings up all secondary > cpus correctly. I don't have Fam15hModel30h system currently up, but > I'll try that too tomorrow. > > I am yet to get feedback from HW folks regarding this though.
Tested a delay of 0 on Fam10h and Fam15h Model 30h-3fh and both work fine.
Feedback from asking internally about this is that we should be OK to move to a no-delay default from K8 onwards.
Thanks, -Aravind.
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