[Bug 78253] New: Increasingly slow and jerky performance over time while playing WoW

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78253

          Priority: medium
            Bug ID: 78253
          Assignee: xorg-driver-ati at lists.x.org
           Summary: Increasingly slow and jerky performance over time
                    while playing WoW
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: rankincj at googlemail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/Radeon
           Product: xorg

When playing WoW for several hours, I notice that the game-play becomes
increasingly jerky over time. Once this effect has become noticeable, the game
takes longer to exit as well - often several minutes. There is no response to
either keyboard or mouse movements during this interval, although the box seems
to behave normally enough when eventually the (full-screen) game window
disappears and my desktop returns.

When I attached gdb to the X server during one particularly unresponsive
interval, I discovered that it was looping in DRI2DrawableGone: 

0x00000000005732b4 in DRI2DrawableGone (p=0x1de81e0, id=1117964837) at
dri2.c:382
382         xorg_list_for_each_entry_safe(ref, next, &pPriv->reference_list,
link) {

This is with a Radeon HD4890 / 3.14.2 / x86_64, although the problem has
actually existed for several months.

(gdb) bt
#0  0x00000000005732b4 in DRI2DrawableGone (p=0x1de81e0, id=1117964837) at
dri2.c:382
#1  0x000000000045cd92 in doFreeResource (res=res at entry=0x35b93c0,
skip=skip at entry=0) at resource.c:873
#2  0x000000000045df47 in FreeClientResources (client=client at entry=0x27415d0)
at resource.c:1139
#3  0x00000000004396ef in CloseDownClient (client=client at entry=0x27415d0) at
dispatch.c:3402
#4  0x000000000043a33e in Dispatch () at dispatch.c:444
#5  0x00000000004288da in main (argc=12, argv=0x7fffc5b26e38, envp=<optimized
out>) at main.c:298

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