[igt-dev] [Intel-gfx] [PATCH i-g-t] i915/gem_exec_parse: Switch to a fixed timeout for basic-allocations

[Chris Wilson]

Quoting Chris Wilson (2019-02-11 17:23:57)
> Quoting Tvrtko Ursulin (2019-02-11 17:18:02)
> > I'd prefer if we just let it run and don't involve wedge/unwedge. Well 
> > actually... we could modify the submit loop to sync a bit rather than 
> > build a queue for 20 seconds? Would sync after each execbuf be 
> > detrimental to test goals? Alternatively submit maybe ARRAY_SIZE worth 
> > and then sync?
> 
> Yes, syncing affects i915_gem_batch_pool.c. The length of the cache
> lists is largely determined by the number of batches in flight.

Along those lines, it's probably worthwhile to stress fixed object sizes
as well, and make those batches long last, yet still quick to parse.

It's worth bearing in mind that another user of i915_gem_batch_pool are
GPU relocs, so this issue isn't just limited to gen7-cmdparser.
-Chris