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Date: Sun, 16 Dec 2007 00:58:40 +0100
From: Harald Schmalzbauer <h.schmalzbauer@omnisec.de>
Organization: OmniSEC
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Subject: sbp/da (ohci) write regression (da-quirk removement problem?)
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Hello,

I wanted to archive something on my external firewire drive and
recognized a massive write performance degradation over 7-current from 3
months ago.
I could read _and_ write about 30MB/s, reading still gives me a value
like that but writing broke down to 1,4 MB/s!!!
Also I see some warnings I haven't seen before:

da4 at sbp0 bus 0 target 0 lun 0
da4: <NEWMOTIO 2045-11 0135> Fixed Simplified Direct Access SCSI-4 device=

da4: 50.000MB/s transfers
da4: 39083MB (80043264 512 byte sectors: 255H 63S/T 4982C)
(da4:sbp0:0:0:0): SYNCHRONIZE CACHE. CDB: 35 0 0 0 0 0 0 0 0 0
(da4:sbp0:0:0:0): ABORTED COMMAND asc:20,0
(da4:sbp0:0:0:0): Invalid command operation code
(da4:sbp0:0:0:0): SYNCHRONIZE CACHE. CDB: 35 0 0 0 0 0 0 0 0 0
(da4:sbp0:0:0:0): ABORTED COMMAND csi:0,ae,47,c4 asc:20,0
(da4:sbp0:0:0:0): Invalid command operation code

I remember that some da-quirks have been removed, respectivley code was
written to detect umass drives more generally.
Possibly that's the culprit?

Any help highly appreciated.

Thanks,

-Harry


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