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List: freedesktop-dbus
Subject: Re: dbus_connection_send_with_reply_and_block eats 100% CPU then eventually times out
From: Alex Brooks <a.brooks () marathon-targets ! com>
Date: 2015-01-31 21:59:16
Message-ID: 54CD5034.1040905 () marathon-targets ! com
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On 01/02/15 03:12, Ralf Habacker wrote:
>
> Am 31.01.2015 um 16:10 schrieb Ralf Habacker:
>>
>> Am 31.01.2015 um 14:49 schrieb Ralf Habacker:
>>>> 5 19:27, "Ralf Habacker" <ralf@habacker.de
>>>> <mailto:ralf@habacker.de>> wrote:
>>>>
>>>>
>>>> Am 31.01.2015 um 05:04 schrieb Alex Brooks:
>>>> > Hi,
>>>> >
>>>> > I've been fighting for a long time with what now looks like a
>>>> libdbus
>>>> > bug.
>>>> > I have a cut-down test program which calls a dbus method of
>>>> > wpa_supplicant at 100Hz, it does this happily for several
>>>> hours then
>>>> > at some point the behaviour changes: any future calls sit at
>>>> 100% CPU
>>>> > for 25sec then time out.
>>>>
>> After running about 54 minutes I got:
>>
>> counts time (ms)
>> 300272 3245606 signalInfo rssi=-63
>> 300273 3245616 signalInfo rssi=-63
>> Error: wpa_supplicant DBus error in signalPoll: Did not receive a
>> reply. Possible causes include: the remote application did not send a
>> reply, the message bus security policy blocked the reply, the reply
>> timeout expired, or the network connection was broken.
>>
> second run gave same results:
> ...
>
> 300272 3548324 1 signalInfo rssi=-57
> 300273 3548413 79 signalInfo rssi=-59
> Error: wpa_supplicant DBus error in signalPoll: Did not receive a
> reply. Possible causes include: the remote application did not send a
> reply, the message bus security policy blocked the reply, the reply
> timeout expired, or the network connection was broken.
In my case when it's in this state, it consumes 100% CPU.
> Sounds as a kind of limits reached. The counts are collected as shown
> below:
>
> while ( true )
> {
> try {
> int a = timer.elapsed();
> int rssi = signalPoll( *netDevInterfaceInterface_ );
> int b = timer.elapsed();
> cout << i++ << " " << b << " " << (b-a) << " signalInfo
> rssi=" << rssi << endl;
> }
>
>> Ralf
>>
>>
>> _______________________________________________
>> dbus mailing list
>> dbus@lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/dbus
>
--
------------------------------
Dr Alex Brooks
Marathon Targets Pty Ltd
Ph: +61 2 8090 7202
Web: www.marathon-targets.com
------------------------------
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<div class="moz-cite-prefix">On 01/02/15 03:12, Ralf Habacker wrote:<br>
</div>
<blockquote cite="mid:54CCFEDA.5000703@habacker.de" type="cite">
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
<br>
<div class="moz-cite-prefix">Am 31.01.2015 um 16:10 schrieb Ralf
Habacker:<br>
</div>
<blockquote cite="mid:54CCF07F.5060902@habacker.de" type="cite">
<meta content="text/html; charset=UTF-8"
http-equiv="Content-Type">
<br>
<div class="moz-cite-prefix">Am 31.01.2015 um 14:49 schrieb Ralf
Habacker:<br>
</div>
<blockquote cite="mid:54CCDD4E.9060505@habacker.de" type="cite">
<meta content="text/html; charset=UTF-8"
http-equiv="Content-Type">
<blockquote
cite="mid:CAE8XxP-w5Fjbfd_ENdNh2sY=AOkgbnNfSuJF1N0ACVq+8mf2YA@mail.gmail.com"
type="cite">
<div class="gmail_quote">5 19:27, "Ralf Habacker" <<a
moz-do-not-send="true" \
href="mailto:ralf@habacker.de">ralf@habacker.de</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Am 31.01.2015 um 05:04 schrieb Alex Brooks:<br>
> Hi,<br>
><br>
> I've been fighting for a long time with what now
looks like a libdbus<br>
> bug.<br>
> I have a cut-down test program which calls a dbus
method of<br>
> wpa_supplicant at 100Hz, it does this happily for
several hours then<br>
> at some point the behaviour changes: any future
calls sit at 100% CPU<br>
> for 25sec then time out.<br>
</blockquote>
</div>
</blockquote>
</blockquote>
After running about 54 minutes I got: <br>
<br>
counts time (ms) <br>
300272 3245606 signalInfo rssi=-63<br>
300273 3245616 signalInfo rssi=-63<br>
Error: wpa_supplicant DBus error in signalPoll: Did not receive
a reply. Possible causes include: the remote application did not
send a reply, the message bus security policy blocked the reply,
the reply timeout expired, or the network connection was broken.<br>
<br>
</blockquote>
second run gave same results: <br>
...<br>
<br>
300272 3548324 1 signalInfo rssi=-57<br>
300273 3548413 79 signalInfo rssi=-59<br>
Error: wpa_supplicant DBus error in signalPoll: Did not receive a
reply. Possible causes include: the remote application did not
send a reply, the message bus security policy blocked the reply,
the reply timeout expired, or the network connection was broken.<br>
</blockquote>
<br>
In my case when it's in this state, it consumes 100% CPU.<br>
<br>
<blockquote cite="mid:54CCFEDA.5000703@habacker.de" type="cite">
Sounds as a kind of limits reached. The counts are collected as
shown below:<br>
<br>
while ( true )<br>
{<br>
try {<br>
int a = timer.elapsed();<br>
int rssi = signalPoll( *netDevInterfaceInterface_ );<br>
int b = timer.elapsed();<br>
cout << i++ << " " << b << " "
<< (b-a) << " signalInfo rssi=" << rssi <<
endl;<br>
}<br>
<br>
<blockquote cite="mid:54CCF07F.5060902@habacker.de" type="cite">
Ralf <br>
<br>
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<br>
<pre wrap="">_______________________________________________
dbus mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" \
href="mailto:dbus@lists.freedesktop.org">dbus@lists.freedesktop.org</a> <a \
moz-do-not-send="true" class="moz-txt-link-freetext" \
href="http://lists.freedesktop.org/mailman/listinfo/dbus">http://lists.freedesktop.org/mailman/listinfo/dbus</a>
</pre>
</blockquote>
<br>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
------------------------------
Dr Alex Brooks
Marathon Targets Pty Ltd
Ph: +61 2 8090 7202
Web: <a class="moz-txt-link-abbreviated" \
href="http://www.marathon-targets.com">www.marathon-targets.com</a>
------------------------------
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