[prev in list] [next in list] [prev in thread] [next in thread]
List: dns-operations
Subject: [dns-operations] Truncated, retrying in TCP mode
From: "Subramanian, Karthikeyan" <Karthikeyan_Subramanian () intuit ! com>
Date: 2016-07-26 14:24:01
Message-ID: 4D1F3C13-EC0A-42C2-B2B3-93C66D070005 () intuit ! com
[Download RAW message or body]
[Attachment #2 (text/plain)]
Hi All,
Need suggestion.
we are seeing delay in TCP query for 4sec in some set of caching servers (Its acting \
as a forwarder). The query is having bunch of NS (61 Name server) so its truncating \
to TCP. Only the delay is happening on particular set of forwarders.
OS
Linux 2.6.32-642.el6.x86_64
I got this option from one site to set the "net.ipv4.tcp_limit_output_bytes" to 128K \
(https://lwn.net/Articles/507065/) The default value of this limit is 128KB; it could \
be set lower on systems where latency is the primary concern.
/proc/sys/net/ipv4/tcp_limit_output_bytes
- net.ipv4.tcp_limit_output_bytes = 262144
+ net.ipv4.tcp_limit_output_bytes = 131072
Need advice on this.
Thanks
Karthikeyan.S
[Attachment #3 (text/html)]
<html 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=utf-8">
<meta name="Title" content="">
<meta name="Keywords" content="">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:Calibri;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:Calibri;
color:windowtext;}
span.msoIns
{mso-style-type:export-only;
mso-style-name:"";
text-decoration:underline;
color:teal;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:Calibri;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style>
</head>
<body bgcolor="white" lang="EN-US" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:15.0pt">Hi \
All,<o:p></o:p></span></p> <p class="MsoNormal" style="text-autospace:none"><span \
style="font-size:15.0pt"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span style="font-size:15.0pt">Need \
suggestion.<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span \
style="font-size:15.0pt"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span style="font-size:15.0pt">we are seeing delay in TCP \
query for 4sec in some set of caching servers (Its acting as a \
forwarder).<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span style="font-size:15.0pt">The query is having bunch \
of NS (61 Name server) so its truncating to TCP. Only the delay is happening on \
particular set of forwarders. <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span \
style="font-size:15.0pt"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span style="font-size:15.0pt">OS<o:p></o:p></span></p> \
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:15.0pt">Linux \
2.6.32-642.el6.x86_64<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span \
style="font-size:15.0pt"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span style="font-size:15.0pt">I got this option from one \
site to set the "net.ipv4.tcp_limit_output_bytes" to 128K (</span><u><span \
style="font-size:14.0pt;font-family:Helvetica;color:blue"><a \
href="https://lwn.net/Articles/507065/)">https://lwn.net/Articles/507065/)</a><o:p></o:p></span></u></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:15.0pt">The \
default value of this limit is 128KB; it could be set lower on systems where latency \
is the primary concern.<o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span \
style="font-size:15.0pt">/proc/sys/net/ipv4/tcp_limit_output_bytes<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:15.0pt">- \
net.ipv4.tcp_limit_output_bytes = 262144<o:p></o:p></span></p> <p \
class="MsoNormal"><span style="font-size:15.0pt">+ \
net.ipv4.tcp_limit_output_bytes = 131072</span><span \
style="font-size:11.0pt"><o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span \
style="font-size:15.0pt"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span style="font-size:15.0pt">Need advice on \
this.<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:11.0pt"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
style="font-family:"Times New Roman"">Thanks<o:p></o:p></span></p> <p \
class="MsoNormal"><span style="font-family:"Times New \
Roman"">Karthikeyan.S<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-family:"Times New Roman""> <o:p></o:p></span></p> <p \
class="MsoNormal"><o:p> </o:p></p> </div>
</body>
</html>
_______________________________________________
dns-operations mailing list
dns-operations@lists.dns-oarc.net
https://lists.dns-oarc.net/mailman/listinfo/dns-operations
dns-operations mailing list
https://lists.dns-oarc.net/mailman/listinfo/dns-operations
--===============1537113806501112886==--
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic