Date: Sat, 21 Mar 2009 20:04:41 +0100 From: Gary Jennejohn <gary.jennejohn@freenet.de> To: Chuck Robey <chuckr@telenix.org> Cc: Alexander Best <alexbestms@math.uni-muenster.de>, freebsd-current@freebsd.org, Justin Hibbits <jrh29@alumni.cwru.edu> Subject: Re: weird console output Message-ID: <20090321200441.573995af@ernst.jennejohn.org> In-Reply-To: <49C5378B.40307@telenix.org> References: <permail-20090321000225f7e55a9d000016a3-a_best01@message-id.uni-muenster.de> <20090321004908.GA9482@narn.knownspace> <20090321102235.1b69134f@ernst.jennejohn.org> <49C5378B.40307@telenix.org>
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On Sat, 21 Mar 2009 14:52:59 -0400 Chuck Robey <chuckr@telenix.org> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Gary Jennejohn wrote: > > On Fri, 20 Mar 2009 20:49:08 -0400 > > Justin Hibbits <jrh29@alumni.cwru.edu> wrote: > > > >> On Sat, Mar 21, 2009 at 01:02:25AM +0100, Alexander Best wrote: > >>> very often when i boot or shutdown my pc i see weird text being output to the > >>> console. to me it seems like 2 messages are being mixed into 1 message. here's > >>> an example: > >>> > >>> "WcAdR0N IaNtG : aWtIaT1N EbSuSs o0p ttiaorng eetn a1b lleudn, 0e > >>> xcpde0c:t r<eHdLu-cDeTd- SpTe rDfVoDrRmAaMn cGeS.A- > >>> H1W0ANR NJILN1G: DIAG2N>O SRTeImCo voapbtlieo nC De-nRaObMl eSdC,S Ie-x0p > >>> edcetv irceed uc > >>> ecdd 0p:e r3f3o.r0m0a0nMcB/es. > >>> transfers" > >>> > >>> i'm running FreeBSD moshnroll 8.0-CURRENT FreeBSD 8.0-CURRENT #20 r190162M: > >>> Fri Mar 20 19:10:47 UTC 2009 root@moshnroll:/usr/obj/usr/src/sys/ARUNDEL > >>> i386, but i've also had this issue under CURRENT. maybe this issue is smp > >>> related? > >>> > >>> cheers. > >>> alex > >> You are correct, it is smp related. Those are two messages interlaced. I see > >> them often when shutting down my SMP system. > >> > > > > This quesion is asked and answered again and again. > > > > Set "options PRINTF_BUFR_SIZE=128" in your kernel config. > > Gary, do you know why setting it to 128 fixes things? Is the default size 0? I > could see that causing things, but it's hard to believe. I've been watching a > long time to see a fix for this. > Looking at /sys/kern/subr_prf.c, there's apparently no buffering at all when PRINTF_BUFR_SIZE isn't defined. The value 128 has proved itself to be adequate based on experience since most kernel output is smaller than that. Its' what I and others use. --- Gary Jennejohn
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