Date: Fri, 1 Mar 2019 13:35:04 -0800 (PST) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: Mark Millard <marklmi@yahoo.com> Cc: Bruce Evans <brde@optusnet.com.au>, freebsd-hackers Hackers <freebsd-hackers@freebsd.org>, Konstantin Belousov <kib@freebsd.org>, FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: powerpc64 head -r344018 stuck sleeping problems: th->th_scale * tc_delta(th) overflows unsigned 64 bits sometimes [patched failed] Message-ID: <201903012135.x21LZ4fM063885@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <908615FE-0638-4A80-A3C9-6FC36219ECC3@yahoo.com>
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( ... trimmed ... ) > > The most useful timecounters are TSC's, and these give another overflow > > in tc_delta() after 1 second when their frequency is 4 GHz (except the > > bogus TSC-low timecounter reduces the frequency to below 2 binary GHz, > > so the usual case is overflow after 2 seconds). > > The wording suggests a amd64/i386 context but my report was for > powerpc64, specifically for old PowerMac G5's. (I currently have\access > to only one ut I've seen the beuavior on others in the last.) > FreeBSD reports: I have access to 2, one is mine and the others is dexter@'s, both of them are now located at his place, but are available for testing. -- Rod Grimes rgrimes@freebsd.org
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