From: "Li, Weinan Z" <weinan.z.li@intel.com>
To: Chris Wilson <chris@chris-wilson.co.uk>
Cc: "intel-gfx@lists.freedesktop.org"
<intel-gfx@lists.freedesktop.org>,
"intel-gvt-dev@lists.freedesktop.org"
<intel-gvt-dev@lists.freedesktop.org>
Subject: Re: [PATCH 1/2] drm/i915: ignore posting read when using vgpu
Date: Thu, 26 Jan 2017 04:53:07 +0000 [thread overview]
Message-ID: <9BD218709B5F2A4F96F08B4A3B98A89768506EBF@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <20170125071329.GA10793@nuc-i3427.alporthouse.com>
I am not sure if native driver still need POSTING_READ action. But for guest we can remove it directly.
Search the code, there are still upon 270 hints use POSTING_READ.
For guest OS, one frequent POSTING_READ_FW action is in irq handler, it will impact the performance if there is heavy interrupts(like media reference usage.)
Thanks.
Best Regards.
Weinan, LI
> -----Original Message-----
> From: Chris Wilson [mailto:chris@chris-wilson.co.uk]
> Sent: Wednesday, January 25, 2017 3:13 PM
> To: Li, Weinan Z <weinan.z.li@intel.com>
> Cc: intel-gfx@lists.freedesktop.org; intel-gvt-dev@lists.freedesktop.org
> Subject: Re: [Intel-gfx] [PATCH 1/2] drm/i915: ignore posting read when
> using vgpu
>
> On Wed, Jan 25, 2017 at 02:04:55PM +0800, Weinan Li wrote:
> > No need to do posting read when vgpu actived.
>
> No. This is bloat for no gain. Almost all of those posting reads are superfluous
> anyway.
> -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre
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next prev parent reply other threads:[~2017-01-26 4:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-25 6:04 [PATCH 1/2] drm/i915: ignore posting read when using vgpu Weinan Li
2017-01-25 6:04 ` [PATCH 2/2] drm/i915: ignore forcewake get/put " Weinan Li
2017-01-25 7:16 ` Chris Wilson
2017-01-25 12:37 ` Li, Weinan Z
2017-01-25 7:13 ` [PATCH 1/2] drm/i915: ignore posting read " Chris Wilson
2017-01-26 4:53 ` Li, Weinan Z [this message]
2017-01-25 7:24 ` ✗ Fi.CI.BAT: warning for series starting with [1/2] " Patchwork
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