From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 104598] vkmark with kwin compositing: Page flip failed: Cannot allocate memory Date: Tue, 15 May 2018 16:18:57 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0099061507==" Return-path: Received: from culpepper.freedesktop.org (culpepper.freedesktop.org [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id 94C9C6E25D for ; Tue, 15 May 2018 16:18:57 +0000 (UTC) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============0099061507== Content-Type: multipart/alternative; boundary="15264011370.c405381.514" Content-Transfer-Encoding: 7bit --15264011370.c405381.514 Date: Tue, 15 May 2018 16:18:57 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D104598 Michel D=C3=A4nzer changed: What |Removed |Added ---------------------------------------------------------------------------- Component|DRM/AMDgpu |DRM/other --- Comment #7 from Michel D=C3=A4nzer --- Thanks, I was finally able to reproduce this. Seems like it's only reproduc= ible if the app runs at >=3D ~10K FPS. It happens because the client submits so many PresentPixmap requests within= a single vertical blank period that the corresponding DRM vblank events fill = up the kernel DRM event queue. Then when the compositor sends a PresentPixmap request, the page flip ioctl gets -ENOMEM from drm_event_reserve_init and propagates it. (That the modesetting driver can't deal with this is its bug) Options for addressing this: The kernel might allow queuing page flip events even when the queue is full with vblank events. The xserver present code should be able to re-use a single DRM vblank event= for multiple client requests with the same target MSC. --=20 You are receiving this mail because: You are the assignee for the bug.= --15264011370.c405381.514 Date: Tue, 15 May 2018 16:18:57 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated = Michel D=C3=A4nzer changed bug 10459= 8

What	Removed	Added
Component	DRM/AMDgpu	DRM/other

Commen= t # 7 on bug 10459= 8 from Michel D=C3=A4nzer

Thanks, I was finally able to reproduce this. Seems like it's =
only reproducible
if the app runs at >=3D ~10K FPS.

It happens because the client submits so many PresentPixmap requests within=
 a
single vertical blank period that the corresponding DRM vblank events fill =
up
the kernel DRM event queue. Then when the compositor sends a PresentPixmap
request, the page flip ioctl gets -ENOMEM from drm_event_reserve_init and
propagates it. (That the modesetting driver can't deal with this is its bug)

Options for addressing this:

The kernel might allow queuing page flip events even when the queue is full
with vblank events.

The xserver present code should be able to re-use a single DRM vblank event=
 for
multiple client requests with the same target MSC.

You are receiving this mail because:

You are the assignee for the bug.

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