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Re: IT821x force pass through mode incantation?



On Fri, Apr 14, 2006 at 10:52:08PM -0400, G.Wolfe Woodbury wrote:
> On Fri, Apr 14, 2006 at 12:37:01PM -0400, Alan Cox wrote:
> > On Fri, Apr 14, 2006 at 12:29:13PM -0400, G.Wolfe Woodbury wrote:
> > > Now, the device/driver is consistently dropping interrupts and having DMA 
> > > timeouts.  It is in sore need of some work.
> > 
> > If it is missing all the IRQs then that sounds like a board level IRQ routing
> > problem not a driver one. If it only misses some then it may be driver level.
> > I'm working on a new it821x driver for libata but I'd appreciate a detailed
> > report of the problem you have and maybe can chase down old driver bugs too.
> > 
> > Alan
> 
> It obviously doesn't miss all the interrupts, since it manages to get information from
> the drive.
> 
> The situation is that under heavy load the system apparently loses some interrupts
> an freezes the system.  There are no remains to post mortem, as the system has to
> be reset to recover.  I can reliably make the system lock up by adding BOINC(SETI Home)
> to the mix.
> 
> This is with the card in smart mode, but no RAID setup on the attached disks.
> That is, two Hitachi DeskStar 400GB drives are attached, but they are not configured
> as members of a RAID set.
> 
> When I add the it821x.noraid=1 to the kernel command line, then the system won't even boot
> because all the interrupts get lost somewhere.  It is a little odd, since "hde" will eventually
> work, but "hdf" (an identical drive) drops nearly every interrupt in pass through mode.

I need to follow myself up to note that the kernel is the xen0 kernel that is getting 
all these errors!  2080 without xen is working quite well in pass through mode.  In smart
mode, however, there are load related problems.

G.Wolfe Woodbury

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