Date: Mon, 29 Mar 2010 10:30:38 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Masoom Shaikh <masoom.shaikh@gmail.com> Cc: freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org, Ivan Voras <ivoras@freebsd.org>, freebsd-questions@freebsd.org Subject: Re: random FreeBSD panics Message-ID: <20100329173038.GA4969@icarus.home.lan> In-Reply-To: <b10011eb1003291001u767b860aybfc95286d6b04ea6@mail.gmail.com> References: <b10011eb1003280128k4034e667v1377205888e7a2d@mail.gmail.com> <honb8m$ncu$1@dough.gmane.org> <b10011eb1003280418l2038c651saf0d09fc48ab3966@mail.gmail.com> <9bbcef731003280503q4993e5b4ud8d874b8e9c376a9@mail.gmail.com> <b10011eb1003280742i3d45b14bu6492328ce5bc745a@mail.gmail.com> <9bbcef731003281038x33b8a9atc2a81d22aa26468@mail.gmail.com> <b10011eb1003291001u767b860aybfc95286d6b04ea6@mail.gmail.com>
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On Mon, Mar 29, 2010 at 05:01:02PM +0000, Masoom Shaikh wrote: > On Sun, Mar 28, 2010 at 5:38 PM, Ivan Voras <ivoras@freebsd.org> wrote: > > On 28 March 2010 16:42, Masoom Shaikh <masoom.shaikh@gmail.com> wrote: > > > >> lets assume if this is h/w problem, then how can other OSes overcome > >> this ? is there a way to make FreeBSD ignore this as well, let it > >> result in reasonable performance penalty. > > > > Very probably, if only we could detect where the problem is. > > Try adding "options PRINTF_BUFR_SIZE=128" to the kernel > > this option is already there The key word in Ivan's phrase is "less mangled". Neither use of or increasing PRINTF_BUFR_SIZE solves the problem of interspersed console output. I've been ranting/raving about this problem for years now; it truly looks like a mutex lock issue (or lack of such lock), but I've been told numerous times that isn't the case. To developers: what incentives would help get this issue well-needed attention? This problem makes kernel debugging, panic analysis, and other console-oriented viewing basically impossible. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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