From owner-freebsd-hackers@freebsd.org Fri Mar 1 21:35:10 2019 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C24B71501C3E; Fri, 1 Mar 2019 21:35:10 +0000 (UTC) (envelope-from freebsd-rwg@pdx.rh.CN85.dnsmgr.net) Received: from pdx.rh.CN85.dnsmgr.net (br1.CN84in.dnsmgr.net [69.59.192.140]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id A6FEE92999; Fri, 1 Mar 2019 21:35:09 +0000 (UTC) (envelope-from freebsd-rwg@pdx.rh.CN85.dnsmgr.net) Received: from pdx.rh.CN85.dnsmgr.net (localhost [127.0.0.1]) by pdx.rh.CN85.dnsmgr.net (8.13.3/8.13.3) with ESMTP id x21LZ4D5063886; Fri, 1 Mar 2019 13:35:04 -0800 (PST) (envelope-from freebsd-rwg@pdx.rh.CN85.dnsmgr.net) Received: (from freebsd-rwg@localhost) by pdx.rh.CN85.dnsmgr.net (8.13.3/8.13.3/Submit) id x21LZ4fM063885; Fri, 1 Mar 2019 13:35:04 -0800 (PST) (envelope-from freebsd-rwg) From: "Rodney W. Grimes" Message-Id: <201903012135.x21LZ4fM063885@pdx.rh.CN85.dnsmgr.net> Subject: Re: powerpc64 head -r344018 stuck sleeping problems: th->th_scale * tc_delta(th) overflows unsigned 64 bits sometimes [patched failed] In-Reply-To: <908615FE-0638-4A80-A3C9-6FC36219ECC3@yahoo.com> To: Mark Millard Date: Fri, 1 Mar 2019 13:35:04 -0800 (PST) CC: Bruce Evans , freebsd-hackers Hackers , Konstantin Belousov , FreeBSD PowerPC ML X-Mailer: ELM [version 2.4ME+ PL121h (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII X-Rspamd-Queue-Id: A6FEE92999 X-Spamd-Bar: +++ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [3.12 / 15.00]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; NEURAL_SPAM_SHORT(0.91)[0.913,0]; IP_SCORE(0.00)[ip: (0.06), ipnet: 69.59.192.0/19(0.03), asn: 13868(0.01), country: US(-0.07)]; MIME_GOOD(-0.10)[text/plain]; RCVD_TLS_LAST(0.00)[]; DMARC_NA(0.00)[dnsmgr.net]; AUTH_NA(1.00)[]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; MX_GOOD(-0.01)[cached: pdx.rh.CN85.dnsmgr.net]; NEURAL_SPAM_LONG(0.46)[0.463,0]; NEURAL_SPAM_MEDIUM(0.85)[0.845,0]; R_SPF_NA(0.00)[]; FREEMAIL_TO(0.00)[yahoo.com]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:13868, ipnet:69.59.192.0/19, country:US]; FREEMAIL_CC(0.00)[optusnet.com.au]; MID_RHS_MATCH_FROM(0.00)[] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Mar 2019 21:35:10 -0000 ( ... 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