[Bug 221106] New: [TTM] Buffer eviction failed - associated with screen freezes with QXL/Spice

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221106

            Bug ID: 221106
           Summary: [TTM] Buffer eviction failed - associated with screen
                    freezes with QXL/Spice
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: devzero@web.de
        Regression: No

Hello, 

i opened up a bugticket at https://bugzilla.proxmox.com/show_bug.cgi?id=7320 ,
which was closed with the notice, that nobody would probably fix QXL driver
issues anymore. 

as we can see, spice qxl is much better quality then virtio:
https://lindi.iki.fi/lindi/qxl/spice_qxl_vs_virtio.webm, so i don't want to
give up that early. 

from my suspicion, i'm not sure if this is only a qxl driver issue but not a
memory management / fragmentation issue around TTM, too - as we have these
messages whenever there are freezes:

[  407.915718] [TTM] Buffer eviction failed
[  690.692852] hrtimer: interrupt took 5425371 ns
[  997.482081] [TTM] Buffer eviction failed
[ 1021.034156] [TTM] Buffer eviction failed
[ 2027.215362] input: spice vdagent tablet as /devices/virtual/input/input9
[ 2481.259265] NOTICE: Automounting of tracing to debugfs is deprecated and
will be removed in 2030
[ 3439.716485] [TTM] Buffer eviction failed

i see a lot of development has been with TTM component, too.

in proxmox, i increased virtual qxl/spice graphics card memory from the default
of 16mb to 32mb and things running much more stable/reliable/smoothly with
that, i could not yet trigger longer freezes like with 16mb, so the question
is, what happens here and why - and could perhapssomeone with deeper knowledge
have a look on what's happening here and what's causing the buffer eviction
failures. the happen in sync with the gui freezes. 

thank you

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