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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [snb] GTT go slow"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84794">84794</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[snb] GTT go slow
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>critical
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<pre>commit ea8596bb2d8d37957f3e92db9511c50801689180
Author: Masami Hiramatsu <<a href="mailto:masami.hiramatsu.pt@hitachi.com">masami.hiramatsu.pt@hitachi.com</a>>
Date: Thu Jul 18 20:47:53 2013 +0900
kprobes/x86: Remove unused text_poke_smp() and text_poke_smp_batch()
functions
Since introducing the text_poke_bp() for all text_poke_smp*()
callers, text_poke_smp*() are now unused. This patch basically
reverts:
3d55cc8a058e ("x86: Add text_poke_smp for SMP cross modifying code")
7deb18dcf047 ("x86: Introduce text_poke_smp_batch() for batch-code
modifying")
and related commits.
This patch also fixes a Kconfig dependency issue on STOP_MACHINE
in the case of CONFIG_SMP && !CONFIG_MODULE_UNLOAD.
Signed-off-by: Masami Hiramatsu <<a href="mailto:masami.hiramatsu.pt@hitachi.com">masami.hiramatsu.pt@hitachi.com</a>>
Reviewed-by: Jiri Kosina <<a href="mailto:jkosina@suse.cz">jkosina@suse.cz</a>>
Cc: H. Peter Anvin <<a href="mailto:hpa@linux.intel.com">hpa@linux.intel.com</a>>
Cc: Steven Rostedt <<a href="mailto:rostedt@goodmis.org">rostedt@goodmis.org</a>>
Cc: Jason Baron <<a href="mailto:jbaron@akamai.com">jbaron@akamai.com</a>>
Cc: <a href="mailto:yrl.pp-manager.tt@hitachi.com">yrl.pp-manager.tt@hitachi.com</a>
Cc: Borislav Petkov <<a href="mailto:bpetkov@suse.de">bpetkov@suse.de</a>>
Link:
<a href="http://lkml.kernel.org/r/20130718114753.26675.18714.stgit@mhiramat-M0-7522">http://lkml.kernel.org/r/20130718114753.26675.18714.stgit@mhiramat-M0-7522</a>
Signed-off-by: Ingo Molnar <<a href="mailto:mingo@kernel.org">mingo@kernel.org</a>>
(bisected and manually checked)
This patch appears to make repeated access through the GTT extremely slow
(roughly equivalent to uc access I would say). This is demonstrated by
igt/gem_gtt_speed, and affects everything using X and mesa
???</pre>
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