https://bugs.freedesktop.org/show_bug.cgi?id=37028 --- Comment #12 from Maggioni Marcello <hayarms@xxxxxxxxx> 2011-06-07 09:15:59 PDT --- Created an attachment (id=47666) --> (https://bugs.freedesktop.org/attachment.cgi?id=47666) Further tests Hi, your test application crashes on my system with and without the patch. I determined that the result that the query should return is 68698 samples each execution. So I modified your test application to see how many times that value is returned instead of some other random values (the modded app is attached) and the output is this: [hades@artemis ~]$ ./query Correct values: 17 Not correct values: 33 Correct values: 50 Not correct values: 0 Correct values: 50 Not correct values: 0 Correct values: 50 Not correct values: 0 Correct values: 50 Not correct values: 0 Correct values: 50 ..... As you can see at the beginning the probability of wrong queries is high and then it corrects itself out. All the subsequent queries seem to be correct. This happens both with your patch and without it. I tried to step inside the gallium code (r600_query_result) to see what values are returned. When the value is correct I get values like: (gdb) n 1641 query->result += end - start; 2: /x end = 0x80000001824291f0 1: /x start = 0x8000000182424e0c ... when I get an error I get values for start and end like : (gdb) n 1641 query->result += end - start; 2: /x end = 0xffffffffffff0000 1: /x start = 0xffff0000ffffffff (gdb) n 1636 for (i = 0; i < size; i += 4) { 2: /x end = 0xffffffffffff0000 1: /x start = 0xffff0000ffffffff (gdb) That are obviously wrong. The very first r600_query_result execution gives correct results, then from the second r600_query_result execution on the results are incorrect and then , after some runs, the values become correct again. I don't know how to interpret this. Maybe a drm bug? I use kernel 2.6.39 -- Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
