From owner-freebsd-current@freebsd.org Mon Nov 30 21:03:46 2020 Return-Path: Delivered-To: freebsd-current@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 0C3504A7D20 for ; Mon, 30 Nov 2020 21:03:46 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 4ClHlP0l01z4gnR for ; Mon, 30 Nov 2020 21:03:44 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: by mailman.nyi.freebsd.org (Postfix) id AECAD4A7D1D; Mon, 30 Nov 2020 21:03:44 +0000 (UTC) Delivered-To: current@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id A37E14A7AB2 for ; Mon, 30 Nov 2020 21:03:44 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4ClHlM4W3Yz4gNw for ; Mon, 30 Nov 2020 21:03:42 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from tom.home (kib@localhost [127.0.0.1]) by kib.kiev.ua (8.16.1/8.16.1) with ESMTPS id 0AUL3TmA060788 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO) for ; Mon, 30 Nov 2020 23:03:32 +0200 (EET) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua 0AUL3TmA060788 Received: (from kostik@localhost) by tom.home (8.16.1/8.16.1/Submit) id 0AUL3TQP060787 for current@freebsd.org; Mon, 30 Nov 2020 23:03:29 +0200 (EET) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Mon, 30 Nov 2020 23:03:29 +0200 From: Konstantin Belousov To: current@freebsd.org Subject: Re: Laptop exhibits erratic responsiveness Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FORGED_GMAIL_RCVD,FREEMAIL_FROM, NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on tom.home X-Rspamd-Queue-Id: 4ClHlM4W3Yz4gNw X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Nov 2020 21:03:46 -0000 On Mon, Nov 30, 2020 at 12:48:47PM -0800, David Wolfskill wrote: > On Mon, Nov 30, 2020 at 05:21:28AM -0800, David Wolfskill wrote: > > ... > > FWIW, the copy of the laptop's "head" kernel config in > > http://www.catwhisker.org/~david/FreeBSD/head/CANARY is current. > > > > And the only difference between the stable/12 config and the head config > > is: > > > > g1-48(12.2-S)[3] diff -u FreeBSD-1{2,3}/CANARY > > --- FreeBSD-12/CANARY 2019-07-08 10:43:51.940026000 -0700 > > +++ FreeBSD-13/CANARY 2015-03-22 10:03:41.000000000 -0700 > > @@ -342,7 +342,7 @@ > > # from some parts of the kernel. As this makes everything more noisy, > > # it is disabled by default. > > # > > -# options DIAGNOSTIC > > +options DIAGNOSTIC > > > > # > > # REGRESSION causes optional kernel interfaces necessary only for regression > > > > Hmmm... so I suppose that re-disbling DIAGNOSTIC might be a reasonable > > thing to try, as well, yeah...? :-} > > .... > > Well, success(ish): > > * I was able to reproduce the observed effect using the newer laptop, > running a kernel from 14 Nov (thus, r367674): > > * I was able to reproduce the observed effect using the newer laptop, > running a kernel from 14 Nov (thus, r367674). (I had cloned the old > laptop's disk drive and slapped it inito the newer laptop.) > > * I then updated the kernel config file ("CANARY") to comment out the > DIAGNOSTIC option, then rebuilt/installed the kernel. > > * Upon reboot, "ping albert" showed remarkably consistent RTTs (compared > to before) -- e.g., the initial example I posted showed: > > --- albert.catwhisker.org ping statistics --- > 67 packets transmitted, 67 packets received, 0.0% packet loss > round-trip min/avg/max/stddev =3D 0.428/1024.248/68482.244/8303.513 ms > > On the newer laptop after the above change, I saw: > > --- albert.catwhisker.org ping statistics --- > 30 packets transmitted, 30 packets received, 0.0% packet loss > round-trip min/avg/max/stddev = 0.463/0.574/0.671/0.054 ms > > Please especially note the maxima & standard deviations. > > > FWIW, I do have (in /boot/loader.conf): > > # Try to reduce WITNESS overhead > vm.debug.divisor=4 > > (which I also utilize at work). > > I suppose I will be commenting out that DIAGNOSTIC option now.... :-} Try to just set debug.vmem_check to 0 and see if it helps.