From: Chris Wilson <chris@chris-wilson.co.uk>
To: Caz Yokoyama <Caz.Yokoyama@intel.com>, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 1/2] drm/i915/selftests: Calculate maximum ring size for preemption chain
Date: Thu, 21 Mar 2019 18:42:15 +0000 [thread overview]
Message-ID: <155319373541.26447.10680934161260721211@skylake-alporthouse-com> (raw)
In-Reply-To: <155319352779.26447.13930453206356439412@skylake-alporthouse-com>
Quoting Chris Wilson (2019-03-21 18:38:53)
> Quoting Caz Yokoyama (2019-03-21 18:41:10)
> > inline
> > -caz
> > On Thu, 2019-03-21 at 07:37 +0000, Chris Wilson wrote:
> > > 32 is too many for the likes of kbl, and in order to insert that many
> > Not only kbl. ring_size is 25 on my cfl.
> >
> > > requests into the ring requires us to declare the first few hung --
> > The hung is not caused by 32. It is caused by accumulation of requests
> > for all prime numbers.
>
> Sure, but the design of the test is that we don't care for more than
> ring_size.
And you can't have more than ring_size requests without hanging on the
spinner. If we pick the maximum that allows for a prime number larger
than ring_size, it hangs irrespective of whether or not you remember to
flush the lo.ctx in between.
-Chris
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next prev parent reply other threads:[~2019-03-21 18:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-21 7:37 [PATCH 1/2] drm/i915/selftests: Calculate maximum ring size for preemption chain Chris Wilson
2019-03-21 7:37 ` [PATCH 2/2] drm/i915/selftests: Mark up preemption tests for hang detection Chris Wilson
2019-03-21 8:41 ` ✓ Fi.CI.BAT: success for series starting with [1/2] drm/i915/selftests: Calculate maximum ring size for preemption chain Patchwork
2019-03-21 17:07 ` ✓ Fi.CI.IGT: " Patchwork
2019-03-21 18:41 ` [PATCH 1/2] " Caz Yokoyama
2019-03-21 18:38 ` Chris Wilson
2019-03-21 18:42 ` Chris Wilson [this message]
2019-03-21 18:57 ` Caz Yokoyama
2019-03-21 18:58 ` Chris Wilson
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