Re: scsi negotiation problem on aic79xx (39320A) in 2.6.14

[Hannes Reinecke <hare@suse.de>]

Michael Stone wrote:
> On Thu, Mar 23, 2006 at 01:37:23PM -0500, James Bottomley wrote:
>> Well, since the driver works normally for most people, it sounds like
>> there's some issue with this configuration.  First of all, look
>> in /sys/class/spi_transport/target2:0:0 and tell me what min_period,
>> max_offset and max_width are.  Then, if min_period is too high, echo
>> 12.5 to it and 1 to revalidate.  Finally, see if you can set the period
>> yourself using the period file.  Also, what does /proc/scsi/aic79xx/2
>> say?  If none of that works, we can try debug the negotiation.
> 
> Thanks for the reply, it's finally working. The min_period was 6.5,
> changing it to 12.5 & revalidating made it properly negotiate 160MB/s
> instead of asynchronous. max_offset was 254 & max_width was 1. Is there
> a way to make that permenant beside setting the proc entries on each boot?
> 
Well, yes. You can limit the transfer speed in the BIOS for that device.
With the latest patches from scsi-misc we're finally picking them up :-)

Cheers,

Hannes
-- 
Dr. Hannes Reinecke			hare@suse.de
SuSE Linux Products GmbH		S390 & zSeries
Maxfeldstraße 5				+49 911 74053 688
90409 Nürnberg				http://www.suse.de

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