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<body><span class="vcard"><a class="email" href="mailto:wendy.wang@intel.com" title="wendy.wang@intel.com">wendy.wang@intel.com</a>
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<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - [BSW]igt/pm_rc6_residency/rc6-accuracy sporadically fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85902">bug 85902</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>ASSIGNED
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>WONTFIX
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - [BSW]igt/pm_rc6_residency/rc6-accuracy sporadically fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85902#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - [BSW]igt/pm_rc6_residency/rc6-accuracy sporadically fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85902">bug 85902</a>
from <span class="vcard"><a class="email" href="mailto:wendy.wang@intel.com" title="wendy.wang@intel.com">wendy.wang@intel.com</a>
</span></b>
<pre>BSW RC6 residency accuracy problem is similar as BYT known bug: <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - [HSW/BYT]Sysfs RC6 residency counter is inaccurate"
href="show_bug.cgi?id=76877">Bug 76877</a> -
[HSW/BYT]Sysfs RC6 residency counter is inaccurate
Base on Jesse's feedback in <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WONTFIX - [HSW/BYT]Sysfs RC6 residency counter is inaccurate"
href="show_bug.cgi?id=76877">bug 76877</a>, also close this bug as will not fix.
"There are a few things going on here:
- the rc6 residency counters don't have a high precision (some of the data
feeding into it is only updated at 1ms intervals)
- reading from userspace introduces potential error, since the reads may
occur further apart than the "time" and "sleep" commands indicate due to
scheduling etc.
So I'm closing this as WONTFIX. We'll have to tolerate some imprecision in
these counters. Since they're for debug only, that should be fine."</pre>
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