Re: strange scsi/CAM related dmesg output

From: Alexander Best <alexbestms_at_uni-muenster.de>
Date: Fri, 18 Jun 2010 17:11:16 +0200
On Mon, Jun 7, 2010 at 3:57 PM, John Baldwin <jhb_at_freebsd.org> wrote:
> 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.

hmmm...can this somehow be fixed? i'm not sure this is specific to
scsi/cam. the other day i bootd my system and almost all of the dmesg
output was displayed incorrectly. would increasing PRINTF_BUFR_SIZE
from 128 to lets say 512 or 1024 solve the issue?

cheers.

>
> --
> John Baldwin
>



-- 
Alexander Best
Received on Fri Jun 18 2010 - 13:11:21 UTC

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