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Date: Sat, 16 Feb 2008 23:33:24 -0700
From: "Justin T. Gibbs" <gibbs@scsiguy.com>
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To: Niki Denev <nike_d@cytexbg.com>
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Cc: freebsd-current@freebsd.org, "Gelsema,
	P \(Patrick\)" <gelsemap@superhero.nl>, JoaoBR <joao@matik.com.br>
Subject: Re: Adaptec AHD U320 operating as only U160
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Niki Denev wrote:
 > I was playing around with DTrace, tracing cam/xpt and the ahd driver and
 > found out that if i comment the following code :
 >
 >         if ((spi3caps & SID_SPI_IUS) == 0)
 >                 spi->ppr_options &= ~MSG_EXT_PPR_IU_REQ;
 >
 > at line 6655 in sys/cam/cam_xpt.c my disks again negotiate as U320 :
 >
 >   da0 at ahd0 bus 0 target 0 lun 0
 >   da0: <SEAGATE ST336807LW 0C01> Fixed Direct Access SCSI-3 device
 >   da0: 320.000MB/s transfers (160.000MHz DT, offset 63, 16bit)
 >   da0: Command Queueing Enabled
 >   da0: 35003MB (71687372 512 byte sectors: 255H 63S/T 4462C)

The aic79xx driver was not properly exporting its capabilities to
CAM.  This has been addressed as of version 1.30 of aic79xx_osm.c.
Please let me know if you still have problems.

 >
 > Unfortunately I began seeing again the "Invalid sequencer interrupt"
 > messages that i was seeing before(with fbsd 6.2) with Seagate drives
 > on Adaptec at U320 speeds, and I prey that they are harmless (as they
 > used to be?)

While I do not know their root cause, they do appear to be harmless.
Do you happen to have your drives in a SES enclosure (on a backplane
with a SES chip)?  One user claimed this was only reproducible when
a GEM318 SES chip was on the bus.

--
Justin