Date: Sat, 15 Sep 2007 18:13:01 -0700 From: Vlad Skvortsov <vss@73rus.com> To: Vlad Skvortsov <vss@73rus.com> Cc: freebsd-usb@freebsd.org Subject: Re: low USB tranfer rate with external IDE Message-ID: <46EC831D.5010808@73rus.com> In-Reply-To: <46D49603.5070301@73rus.com> References: <46D36F3B.70400@73rus.com> <46D3B32A.7080603@yandex.ru> <46D47646.7080509@73rus.com> <20070828.150235.1723238677.imp@bsdimp.com> <46D49603.5070301@73rus.com>
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Vlad Skvortsov wrote: [skipped] > > Ok, I have compiled a kernel with ehci in. Here is a snippet of dmesg > output (right after rebooting the box): > > da0 at umass-sim0 bus 0 target 0 lun 0 > da0: <Maxtor 6 L250R0 BAJ4> Fixed Direct Access SCSI-0 device > da0: 40.000MB/s transfers > da0: 238475MB (488397168 512 byte sectors: 255H 63S/T 30401C) > umass0: BBB reset failed, TIMEOUT > umass0: BBB reset failed, TIMEOUT > umass0: Invalid CSW: sig 0x4628f8ff should be 0x53425355 > (da0:umass-sim0:0:0:0): Synchronize cache failed, status == 0x4, scsi > status == 0x0 > > > Note that it displays high transfer rate this time. I've ran 'diskinfo > -t' to check the actual rate; the seek tests have passed but transfers > hung. 'dd' froze either: > > 13:31 [vss@bear] ~ > dd if=/dev/da0 of=/dev/null bs=1m count=10 > ^C > > Nothing relevant in /var/log/messages. How can I debug it further? > By googling around it seems that these messages may indicate a hardware (enclosure) problem. Can someone share what IDE USB 2.0 enclosures are known to be working OK so that I can rule that possible cause out? -- Vlad Skvortsov, vss@73rus.com, http://vss.73rus.com
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