On Tuesday 28 May 2002 1:13 pm, Keith Whitwell scribed numinously:"
> Tim Smith wrote:
> > On Tuesday 28 May 2002 8:40 am, Keith Whitwell scribed numinously:"
> >
> >>Tim Smith wrote:
> >>>I've done some more digging and it would appear to send an enormous
> >>>amount of commands via radeon_cp_cmdbuf, all ending up going via
> >>>radeon_emit_packet3_cliprect. Actually I don't think it's such a huge
> >>>number compared to other calls (32 commands), except that this time
> >>> the loop gets called with nbox=4 so it emits everything 4 times, and
> >>> runs out of FIFO.
> >>
> >>If it's really a fifo issue, I may have a solution for this in terms of
> >>only writing the ring tail register once per ioctl.
> >
> > Is it in a testable state? If you mail me a patch I'll test it tonight
> > and report.
> >
> > Assuming that RADEON_CP_RB_WPTR is the ring tail register, I count at
> > least 20 writes to it on this one call, and 16 on the previous "clear"
> > (also with nbox=4). And there are 13 consecutive calls to
> > radeon_emit_packet3_cliprect with nbox=4 before it locks, making a
> > total of 260 writes from one call to radeon_cp_cmdbuf.
>
> It's committed on the tcl branch now (it's also a minor optimization).
No so minor actually; the difference between the two may be small, but there
is a noticeable improvement in interactivity when wandering around the 3D
map, at least in my application.
It doesn't fix this lockup though, so I guess it's not a FIFO issue.
The big storm of stuff during which the lockup occurs appears to be
generated by radeonEmitState ('lost context'), so maybe there's something
unpleasant in that lot. It's been called a lot of times before, without
causing trouble though. The only thing I can think of is that this time
there's still a menu window slap bang in the middle of the 3D area (simply
popping up a menu and then taking it away again will not produce the
lockup; I have to pop up a submenu and then let the submenu go away while
its parent is still there to make it lock).
Can anyone give me an idea of sequences which it's known will lock the card,
so I can attempt to determine if any of them is occurring? I'm a
"bottom-up" kind of guy when it comes to bug hunting, especially when I'm
trying to understand the code as I go.
--
Tim Smith ([EMAIL PROTECTED])
Plasteen Construction Grade is a delicacy in the Rhodian System
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