Date: Wed, 8 Nov 2006 18:53:48 +0200 From: Nikolay Pavlov <quetzal@zone3000.net> To: Scott Long <scottl@samsco.org> Cc: Adrian Chadd <adrian@freebsd.org>, freebsd-stable@freebsd.org, Jack Vogel <jfvogel@gmail.com> Subject: Re: em driver testing Message-ID: <20061108165348.GA50453@zone3000.net> In-Reply-To: <45520532.3000603@samsco.org> References: <68011C68-0962-4946-88E1-F36EE7C707DA@redstarling.com> <20061106221219.GA66676@hugo10.ka.punkt.de> <041201c701f9$37b2aed0$9603a8c0@claylaptop> <2a41acea0611061614n478efe77y82c0ebc2e1b01e19@mail.gmail.com> <d763ac660611062047n67058489jeca8d4c79e8c7490@mail.gmail.com> <2a41acea0611062242h42b1bde6w711e9a5039ed1a90@mail.gmail.com> <20061108144003.GA43734@zone3000.net> <20061108154102.GA40238@icarus.home.lan> <45520532.3000603@samsco.org>
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On Wednesday, 8 November 2006 at 9:26:26 -0700, Scott Long wrote: > Jeremy Chadwick wrote: > >On Wed, Nov 08, 2006 at 04:40:03PM +0200, Nikolay Pavlov wrote: > >>Well i have 5.5 box with very similar symptomatic :) > >>I do not see watchdog timeouts on it, but a lot of UP/DOWN events. > > > >Are you sure this is the same problem as what's being discussed > >here? If you revert to a previous kernel or em driver, does the > >problem (link up/down) go away? Are you sure you don't actually > >have a flaky cable or RJ45 connector? What does the switch your > >NIC is connected to say? (does it show link going up and down) > > > >I feel horrible for both Scott and Jack -- I think there's tons > >of people coming out of the woodwork with "ME TOO" comments who > >may in fact be suffering from other problems, and are looking for > >a scapegoat thread. > > > > The timeout/watchdog mechanism in the interface layer has been a problem > ever since the MPSAFE work was done on the network stack. It's prone to > races, and as the OS has improved and gotten faster over the past 2 > years, those races have gotten bigger. In a way, it's a actually a > positive indication of progress and improvement =-) > > I don't doubt that there are users with other problems. We spent some > time collecting as much user data as we could in order to find patterns > and weed out the uncommon cases. But this timer/watchdog thing looks to > be a strong candidate for being the root cause of many of the problems. > We'll continue to investigate these problems and address other drivers. > > Scott Thanks Scott. From my side, I'd like to say that I'm always ready to help you in testing. -- ====================================================================== - Best regards, Nikolay Pavlov. <<<----------------------------------- ======================================================================
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