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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">I added simple logic and few parameters in DummySink to calculate received bit rate in
</span><span style="font-size:10.0pt;font-family:"Courier New";color:#1F497D">afteGettingFrame</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">() of testRTSPClient and printed the same at 30secs of interval. This was showing
birate per stream received. When I opened 4 connections from IP cameras (streaming at 8Mbps CBR) I saw 30-32Mbps data received in application as expected. When I opened 8 streams (effectively 64 Mbps data coming in) from different IP cameras, I saw testRTSPClient
cannot receive more than 25 Mbps of data collectively. I can see ‘ifconfig’ showing 64 Mbps data is received. I mean if I execute ‘ifconfig’ twice with interval of 30 secs and calculate bitrate with difference between ‘RX bytes’ it comes out to be 64Mbps approximately.
I think that means driver is not dropping huge data. I also observed CPU load which was less than 50% so CPU is not overloaded.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Why the same bitrate is not observed in user space? Where the data is being dropped? Is it that the application is not consuming data at enough rate (I mean select
is not getting called fast enough)? <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Before doing this experiment I ensured following things.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Changed DUMMY_SINK_RECEIVE_BUFFER_SIZE to 10000000<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">unsigned RTSPClient::responseBufferSize = 10000000;<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">I have turned my system to set net.core.rmem_max and other parameters. I am also using setReceiveBufferTo() to increase socket receive buffer to 0xDA000.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Please let me know if you can foresee where the bottleneck could be. I’m running linux on receiving side.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Regards.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Yogesh.<o:p></o:p></span></p>
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