Hello all,
I'd like to preface this message by explaining my current setup and how I
use libcurl, and that I've at least isolated it to the libcurl realm (I
think):
- I use libcurl in OpenWRT
- I compile libcurl with ca-bundle and mbedtls
- I use libcurl to make requests and gather response times - where the
response time critical to the functionality of the app - and have been
running libcurl 7.60 for over a year with very consistent results
Using the above, I've setup a couple of tests where I send HTTP requests to
a web server, and made a super simple (and hacked together) test to
visually see the difference. The network conditions for both of the tests
I've done are exactly the same, so I don't believe it's a network related
issue.
(Code /libcurl setup)
#include <stdio.h>
#include </usr/local/include/curl/curl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
int main()
{
CURL * curlhandle = curl_easy_init();
char url[500] = "https://google.com";;
if(curlhandle == NULL)
{
return 0;
}
curl_easy_setopt(curlhandle, CURLOPT_URL, url);
char version[500];
sprintf(version, "Version: %s \n", curl_version());
puts(version);
curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 1L);
curl_easy_setopt(curlhandle, CURLOPT_IPRESOLVE,
CURL_IPRESOLVE_V4);
curl_easy_setopt(curlhandle, CURLOPT_TIMEOUT, 30L);
curl_easy_setopt(curlhandle, CURLOPT_CONNECTTIMEOUT, 45L);
curl_easy_setopt(curlhandle, CURLOPT_NOSIGNAL, 1L);
curl_easy_setopt(curlhandle, CURLOPT_HTTP_VERSION,
CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE);
curl_easy_setopt(curlhandle, CURLOPT_ACCEPT_ENCODING, "");
curl_easy_setopt(curlhandle, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curlhandle, CURLOPT_MAXREDIRS, 2);
curl_easy_setopt(curlhandle, CURLOPT_CAINFO,
"certificate.pem");
curl_easy_setopt(curlhandle, CURLOPT_PROTOCOLS,
CURLPROTO_HTTPS);
curl_easy_setopt(curlhandle, CURLOPT_SSL_ENABLE_ALPN, 1L);
char requestStr[500];
sprintf(requestStr, "Making 100 requests to %s \n", url);
puts(requestStr);
double response_time = 0.0;
char str[900000];
char avg[900000];
long response = 0;
double total_response_times = 0.0;
curl_easy_perform(curlhandle);
curl_easy_getinfo(curlhandle,
CURLINFO_RESPONSE_CODE, &response);
curl_easy_getinfo(curlhandle,
CURLINFO_TOTAL_TIME, &response_time);
sprintf(str, "Response time for %d: %lf
\n", i, response_time);
puts(str);
total_response_times = total_response_times
+ response_time;
}
average_response_time = total_response_times /
numIterations;
sprintf(avg, "Response time average for %s for %i
iterations: %lf \n", url, numIterations, average_response_time);
puts(avg);
curl_easy_cleanup(curlhandle);
return 0;
}
With 7.60 I regularly will get an average of 450-500MS response time
With 7.78 I regularly get between 4000-5500MS response time
This just doesnt seem right to me, and the only way I've found to fix the
issue with my actual app I run on my device is by 'frankenstein'ing the old
version of libcurl into the new firmware. I FEEL as if I'm just missing a
new setting or something has just changed, but I've gone up and down
through the libcurl documents, and still can't figure out what I might be
missing. I'm really hoping that maybe someone on this list might have
noticed the same thing / know what I might be missing.
Thanks in advance,
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