[Bug 94307] [BAT ILK] gem_sync/basic-bsd fails / hangcheck timer elapsed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94307

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
75us is as low as I can go and not start seeing missed seqno writes. An
uncached mmio read + clflush + mfences on this machine is <500ns so the only
explanation is that the GPU adds a significant buffer to the MI_STORE command
that we cannot flush. It's also not documented whether poking SyncFlush flushes
the internal MI_STORE buffer (seems unlikely).

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