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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - SIGBUS, Bus error during command buffer recording"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105509#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - SIGBUS, Bus error during command buffer recording"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105509">bug 105509</a>
from <span class="vcard"><a class="email" href="mailto:ytriffy@gmail.com" title="Vyacheslav <ytriffy@gmail.com>"> <span class="fn">Vyacheslav</span></a>
</span></b>
<pre>So the root cause is the anv_allocator. Command buffer takes up a lot of maped
memory: 2320+4096+16384 bytes for anv_cmd_buffer and surface state, dynamic
state. Then allocator rounds this to be power of 2 - 32KB. So one command
buffer takes up 32KB. And maximum amount of maped memory per device is 1GB.
It's enough for ~32000 command buffers. After that mmap fails.
So default allocator was designed for small number of command buffers.</pre>
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