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its not 1991 anymore, lower default timeout and retry count (#542)

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A lot of time has passed since the original timeouts and retry counts were chosen. We have on and off issues reported due to this. Even on geostationary satellite links, latency is worst case around 1.5s. This PR changes the per-server timeout to 2s and the retry count lowered from 4 to 3.

Fix By: Brad House (@bradh352)
pull/514/head
Brad House 1 year ago committed by GitHub
parent cf99c025cf
commit 7f3262312f
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 5 additions and 5 deletions
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  1. 6
      docs/ares_init_options.3
  2. 4
      src/lib/ares_private.h

6
docs/ares_init_options.3
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@ -73,7 +73,7 @@ description of possible flag values.
The number of seconds each name server is given to respond to a query on the The number of seconds each name server is given to respond to a query on the
first try. (After the first try, the timeout algorithm becomes more first try. (After the first try, the timeout algorithm becomes more
complicated, but scales linearly with the value of \fItimeout\fP.) The complicated, but scales linearly with the value of \fItimeout\fP.) The
default is five seconds. This option is being deprecated by default is two seconds. This option is being deprecated by
\fIARES_OPT_TIMEOUTMS\fP starting in c-ares 1.5.2. \fIARES_OPT_TIMEOUTMS\fP starting in c-ares 1.5.2.
.TP 18 .TP 18
.B ARES_OPT_TIMEOUTMS .B ARES_OPT_TIMEOUTMS
@ -82,7 +82,7 @@ default is five seconds. This option is being deprecated by
The number of milliseconds each name server is given to respond to a query on The number of milliseconds each name server is given to respond to a query on
the first try. (After the first try, the timeout algorithm becomes more the first try. (After the first try, the timeout algorithm becomes more
complicated, but scales linearly with the value of \fItimeout\fP.) The complicated, but scales linearly with the value of \fItimeout\fP.) The
default is five seconds. Note that this option is specified with the same default is two seconds. Note that this option is specified with the same
struct field as the former \fIARES_OPT_TIMEOUT\fP, it is but the option bits struct field as the former \fIARES_OPT_TIMEOUT\fP, it is but the option bits
that tell c-ares how to interpret the number. This option was added in c-ares that tell c-ares how to interpret the number. This option was added in c-ares
1.5.2. 1.5.2.
@ -91,7 +91,7 @@ that tell c-ares how to interpret the number. This option was added in c-ares
.B int \fItries\fP; .B int \fItries\fP;
.br .br
The number of tries the resolver will try contacting each name server The number of tries the resolver will try contacting each name server
before giving up. The default is four tries. before giving up. The default is three tries.
.TP 18 .TP 18
.B ARES_OPT_NDOTS .B ARES_OPT_NDOTS
.B int \fIndots\fP; .B int \fIndots\fP;

4
src/lib/ares_private.h
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@ -39,8 +39,8 @@
#define HAVE_WRITEV 1 #define HAVE_WRITEV 1
#endif #endif
#define DEFAULT_TIMEOUT 5000 /* milliseconds */ #define DEFAULT_TIMEOUT 2000 /* milliseconds */
#define DEFAULT_TRIES 4 #define DEFAULT_TRIES 3
#ifndef INADDR_NONE #ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff #define INADDR_NONE 0xffffffff
#endif #endif

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