Quoting Tvrtko Ursulin (2018-06-29 11:00:30)
>
> On 29/06/2018 08:53, Chris Wilson wrote:
> > Our long standing defense against a single client from flooding the
> > system with requests (causing mempressure and stalls across the whole
> > system) is to retire the old request on every allocation. (By retiring
> > the oldest, we try to keep returning requests back to the system in a
> > steady flow.) This adds an extra step into the submission path that we
> > can reduce simply by moving it to after the submission itself.
> >
> > We already do try to clean up a stale request list after submission, so
> > always retiring all completed requests fits in as a natural extension.
>
> Please add to the commit message what motivated you to do this. Like
> this benchmark, or something, is now better in this or that respect. Or
> something.
This was mentioned in
commit 9512f985c32d45ab439a210981e0d73071da395a
Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date: Thu Jun 28 21:12:11 2018 +0100
drm/i915/execlists: Direct submission of new requests (avoid tasklet/ksoftirqd)
-Chris
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