<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{mso-style-priority:99;
mso-style-link:"Plain Text Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.PlainTextChar
{mso-style-name:"Plain Text Char";
mso-style-priority:99;
mso-style-link:"Plain Text";
font-family:"Calibri","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText>Hi, Ross<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>We did a more accurate investigation about the network performance, the sendto and the buffer size.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>what you say is clear and convinces us, but in the meantime our tests lead us to different considerations.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>1) we have written a little program to send UDP packets on the network, we reach 125 Mbs, <o:p></o:p></p><p class=MsoPlainText>without lose any packets. The test program uses the sendto api.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>2) when we use the live555 software to stream audio-video and the bitrate is > 2 Mbs we <o:p></o:p></p><p class=MsoPlainText>loose several packets. <o:p></o:p></p><p class=MsoPlainText>In this case we are far away from the max network capacity and the sendto call returns <o:p></o:p></p><p class=MsoPlainText>a WSAEWOULDBLOCK error. The buffer size is 100 * 512 = 51200.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>3) When we use the live555 with our modifications, i.e. output buffer size = 204800, the sendto <o:p></o:p></p><p class=MsoPlainText>call always succeed. We are pretty about this sure because we left the streaming <o:p></o:p></p><p class=MsoPlainText>for 48 hours and we never lost any packets.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Summarizing, If we increase output buffer from 51200 to 204800 we get rid of those errors. <o:p></o:p></p><p class=MsoPlainText>Thus, without jumping to conclusions we doubt that the OS’s output buffer fills <o:p></o:p></p><p class=MsoPlainText>up because it is not big enough to sustain the bitrate.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Bye<o:p></o:p></p><p class=MsoNormal><b><o:p> </o:p></b></p><p class=MsoNormal><b><span lang=IT style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#339966'>________________________________________________________________</span></b><span lang=IT style='color:navy'><o:p></o:p></span></p><p class=MsoNormal><b><span lang=IT style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#339966'>Ing. Giovanni Iamonte<o:p></o:p></span></b></p><p class=MsoNormal><b><span lang=IT style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#339966'>Area Tecnologie e sviluppi<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#339966'>Quintetto Srl – Pont Saint Martin (AO)<o:p></o:p></span></b></p><p class=MsoNormal><span lang=IT style='font-size:8.0pt;font-family:Wingdings;color:#339966'>(</span><span lang=IT style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#339966'> </span><b><span lang=IT style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#339966'>mobile: +39 393 9196310<o:p></o:p></span></b></p><p class=MsoNormal><span lang=IT style='font-size:8.0pt;font-family:Wingdings;color:#339966'>(</span><span lang=IT style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#339966'> </span><b><span lang=IT style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#339966'>tel: +39 0165 1845290</span></b><span lang=IT style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#339966'><o:p></o:p></span></p><p class=MsoNormal><span lang=IT style='font-size:8.0pt;font-family:Wingdings;color:#339966'>+</span><span lang=IT style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#339966'> </span><b><span lang=IT style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#339966'>e-mail: <a href="mailto:iamonte@quintetto.it"><span style='color:blue'>iamonte@quintetto.it</span></a></span></b><span lang=IT style='font-size:12.0pt;font-family:"Times New Roman","serif";color:navy'><o:p></o:p></span></p><p class=MsoNormal><span lang=IT style='font-size:8.0pt;font-family:Wingdings;color:#339966'>[</span><span lang=IT style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#339966'> </span><b><span lang=IT style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#339966'>web: <a href="http://www.quintetto.it/" title="http://www.quintetto.it/"><span style='color:blue'>www.quintetto.it</span></a></span></b><span style='color:navy'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>