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Date:      Mon, 7 Jun 2010 09:57:07 -0400
From:      John Baldwin <jhb@freebsd.org>
To:        freebsd-current@freebsd.org
Cc:        Jille Timmermans <jille@quis.cx>, Alexander Best <alexbestms@uni-muenster.de>
Subject:   Re: strange scsi/CAM related dmesg output
Message-ID:  <201006070957.07376.jhb@freebsd.org>
In-Reply-To: <4C0A9D57.8000900@quis.cx>
References:  <AANLkTinPhcc8Z_BdvoEQUv-ZXlHAYOTQJwlUQDVO8iJ9@mail.gmail.com> <6BEF4925-A058-4EFA-B005-30A01B3132FC@samsco.org> <4C0A9D57.8000900@quis.cx>

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On Saturday 05 June 2010 2:54:15 pm Jille Timmermans wrote:
> Scott Long schreef:
> > On Jun 4, 2010, at 4:35 PM, Alexander Best wrote:
> > 
> >> hi there. running HEAD, amd64 and r208806 i get this dmesg output
> >> which doesn't look right:
> >>
> >> ada0 at ahcich2 bus 0 scbus3 target 0 lun 0
> >> ada0: <SAMSUNG SP2504C VT100-50> ATA-7 SATA 2.x device
> >> ada0: 300.000MB/s transferscd0 at ata2 bus 0 scbus2 target 0 lun 0
> >> cd0: <HL-DT-ST DVDRAM GSA-H10N JL12> Removable CD-ROM SCSI-0 device
> >> cd0: 33.300MB/s transfers (UDMA2, ATAPI 12bytes, PIO 65534bytes)
> >> cd0: cd present [1944656 x 2048 byte records]
> >> (SATA 2.x, UDMA6, PIO 8192bytes)
> >> ada0: Command Queueing enabled
> >> ada0: 238474MB (488395055 512 byte sectors: 16H 63S/T 16383C)
> >>
> >>
> >> my kernel contains:
> >>
> >> options         SC_HISTORY_SIZE=1000
> >> options         MSGBUF_SIZE=65536
> >> options         PRINTF_BUFR_SIZE=128
> >>
> >> might this be caused by one of these lines?
> >>
> >> cheers.
> >>
> > 
> > Can you be more specific about what you think is not right?
> > 
> > Scott
> I assume he means that 'cd0 at ata2 ...' is on the same line as the
> third ada0 line. After all the cd0-lines, the ada0 line continues.
> That shouldn't happen with PRINTF_BUFR_SIZE set, should it?

It can happen because the print buffer size thing is not line-buffered, it is 
printf-invocation buffered.

-- 
John Baldwin



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