Morning all,
I agree, the process polls 15 seconds to receive the data.
In the tcpdump trace though, the same data arrive quickly, so something between
low level networkand libcurl recv() on the socket generates this wait.
Do you know of a parameter / reason that could explain this ?
The way we use libcurl:
curl_easy_init() once for the application
loopcurl_easy_setopt() to set exchange parameterscurl_easy_perform() to do the
exchange cur_easy_reset() to reset parametersand so on
regardsOliver
De : Daniel Stenberg <[email protected]>
À : libcurl hacking <[email protected]>
Envoyé le : Mardi 9 août 2016 16h55
Objet : Re: Abnormal delay while receiving answer from a POST
On Tue, 9 Aug 2016, Farabet Olivier wrote:
> - strace : I've called it with -T, there are time info in system calls and
> the system calls during the gap are the following ones
I assume your mailer strips the times then or something because they certainly
don't show up here... But still, look at these strace details:
> [pid 990] write(23, "09/08/2016 10:16:02 curlWriteCal"..., 60) = 60
Is this the last received header?
> [pid 990] poll([{fd=22, events=POLLIN}], 1, 36) = 0 (Timeout)
Timeout the waiting for more data.
> [pid 990] poll([{fd=22, events=POLLIN}], 1, 1000) = 0 (Timeout)
> [pid 990] poll([{fd=22, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1,
> 0) = 0 (Timeout)
... and we see about 14 more timeouts like the one above. Each waiting 1000
milliseconds. That's saying the kernel hasn't delivered any data to the socket
for libcurl to read.
> [pid 990] poll([{fd=22, events=POLLIN}], 1, 1000) = 1 ([{fd=22,
> revents=POLLIN}])
*There*, data has finally arrived after a long time waiting. I can't see that
libcurl does anything wrong there! Can you?
> [pid 990] recvfrom(22, "oll'\" />\r\n <var name=\"TELID"..., 1731,
> 0, NULL, NULL) = 1731
... and it reads 1731 bytes. I assume the rest then follows as it loops to
read more.
--
/ daniel.haxx.se
-------------------------------------------------------------------
List admin: https://cool.haxx.se/list/listinfo/curl-library
Etiquette: https://curl.haxx.se/mail/etiquette.html
-------------------------------------------------------------------
List admin: https://cool.haxx.se/list/listinfo/curl-library
Etiquette: https://curl.haxx.se/mail/etiquette.html
