[Bug 105171] Performance regression running glamor with PutImage workload

[Bug 105171] Performance regression running glamor with PutImage workload

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https://bugs.freedesktop.org/show_bug.cgi?id=105171

            Bug ID: 105171
           Summary: Performance regression running glamor with PutImage
                    workload
           Product: Mesa
           Version: 17.3
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: linuxhippy@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 137456
  --> https://bugs.freedesktop.org/attachment.cgi?id=137456&action=edit
test case

After updating Fedora from mesa-17.2.4 to 17.3.5 I noticed throughput in
XPutImage/XShmPutImage based workloads dropped significantly.

I'd noticed this before with a self-compiled version of mesa-18.0-rc, but
thought this had something to do with the chosen compile flags.

One test went from 40fps to 15fps (very small XPutImage requests immideatly
followed by XRenderComposite), while other degraded by about 30%.

System details:
* AMD Kaveri 7650k
* 4k + FullHD displays
* linux 4.15.3
* radeon kernel driver


How to test:
Run the attached java program and enable the "antialising" checkbox:
java -jar JGears2.jar

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[Bug 105171] Performance regression running glamor with PutImage workload

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https://bugs.freedesktop.org/show_bug.cgi?id=105171

--- Comment #1 from Clemens Eisserer <linuxhippy@gmail.com> ---
currently bisecting...

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[Bug 105171] Performance regression running glamor with PutImage workload

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https://bugs.freedesktop.org/show_bug.cgi?id=105171

--- Comment #2 from Clemens Eisserer <linuxhippy@gmail.com> ---
The commit causing this regression is:

8b3a257851905ff444d981e52938cbf2b36ba830 is the first bad commit
commit 8b3a257851905ff444d981e52938cbf2b36ba830
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Tue Jul 18 16:08:44 2017 -0400

    radeonsi: set a per-buffer flag that disables inter-process sharing (v4)

    For lower overhead in the CS ioctl.
    Winsys allocators are not used with interprocess-sharable resources.

    v2: It shouldn't crash anymore, but the kernel will reject the new flag.
    v3 (christian): Rename the flag, avoid sending those buffers in the BO
list.
    v4 (christian): Remove setting the kernel flag for now

    Reviewed-by: Marek Olšák <marek.olsak@amd.com>

:040000 040000 b775b6b0ea5b971d2165a644ea8912c120f54431
2e4b2737f37ede2bbdbbe6815fe0fa562177c2b7 M      src



x11per -putimage10 regressed from 75 kOps/s to 22 kOps/s after this patch
running Xephyr with vblank disabled.

before:
     400000 reps @   0.0130 msec ( 77000.0/sec): PutImage 10x10 square

after:
     120000 reps @   0.0457 msec ( 21900.0/sec): PutImage 10x10 square

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[Bug 105171] performance regression (3x slower) running glamor with PutImage workload (radeonsi)

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https://bugs.freedesktop.org/show_bug.cgi?id=105171

Clemens Eisserer <linuxhippy@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         QA Contact|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
           Assignee|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
            Summary|Performance regression      |performance regression (3x
                   |running glamor with         |slower) running glamor with
                   |PutImage workload           |PutImage workload
                   |                            |(radeonsi)

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