Date: Fri, 19 Aug 2022 21:43:32 -0400 From: Alexander Motin <mav@FreeBSD.org> To: Kevin Oberman <rkoberman@gmail.com>, current <current@freebsd.org> Subject: Re: Status of Alder Lake support Message-ID: <2ba3e191-64c1-b854-3eb3-080345b56839@FreeBSD.org> In-Reply-To: <CAN6yY1t75UEVBK5cnvwmEopCOyKmcOEX3bRJkRnX37kPa2gkgg@mail.gmail.com> References: <CAN6yY1t75UEVBK5cnvwmEopCOyKmcOEX3bRJkRnX37kPa2gkgg@mail.gmail.com>
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Hi Kevin, On 19.08.2022 20:50, Kevin Oberman wrote: > What is the current state of support for Alder Lake CPUs with a mix of > "performance" and "Efficiency" cores. I just received my first system > with such a processor and will be installing FreeBSD as soon as my SSD > arrives. I have no idea what issues I might run into. (Will it even work?) Generally they work. I have one in my lab since they appeared, and its biggest problem is UEFI console screwed by ASUS, which I partially fixed. At some BIOS versions they also broke PXE booting, but then fixed it in later update. The FreeBSD scheduler still has no idea about P and E cores, just trying to balance load equally based on cache topology (which is not symmetric there), but it is not too bad, since cores performance is not so dramatically different. hwpmc(4) also does not differentiate P and E cores, and since they have different counters, it means that only few universal architectural counters are usable, which are sufficient for basic profiling though. There were some stability issues reported, but were solved by either FreeBSD or BIOS update, so still not really diagnosed AFAIK. -- Alexander Motin
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