[Bug 106887] [CI] igt at gem_ppgtt@blt-vs-render-ctxn - incomplete

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106887

--- Comment #8 from Andi <andi.shyti at intel.com> ---
Just to clarify what I wrote above:

The function gen9_render_copyfunc() is called under a for loop that runs
(32768/8 = ) 4096. This loop is executed by 8 processes simultaneously. In my
tests I always got a failure.

To simplify the debugging I run it in a single thread by applying the
following:

diff --git a/tests/i915/gem_ppgtt.c b/tests/i915/gem_ppgtt.c
index af5e3e07..66b71a68 100644
--- a/tests/i915/gem_ppgtt.c
+++ b/tests/i915/gem_ppgtt.c
@@ -294,7 +294,7 @@ static void flink_and_exit(void)
        close(fd);
 }

-#define N_CHILD 8
+#define N_CHILD 1
 int main(int argc, char **argv)
 {
        igt_subtest_init(argc, argv);

that makes the loop iterate exactly 32768 times in a single process.

NOTE: in a single process the gen9_render_copyfunc() doesn't always fail, but
it does with a high rate.

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