On 9/14/2020 8:13 PM, Kunal Chandarana via curl-library wrote:
This is continuation of an earlier thread
<https://curl.haxx.se/mail/archive-2020-09/0016.html>, that was
addressed to an incorrect audience. Using curl-library mailing for
further discussion.
I further investigated the issue. As I mentioned earlier, we use the
connection pause/unpause feature. If the connection is paused then the
library uses a temporary buffer (pausewrite function
<https://github.com/curl/curl/search?q=pausewrite&unscoped_q=pausewrite>)
for holding the data. I noticed that this buffer continues to increase
(buffer size reaches upto 7mb for 13mb response) and malloc,
memcpy calls on the buffer of this size causes slowness. Further
investigation revealed that buffer size increase has been taking place
since the following change
<https://github.com/curl/curl/commit/e040146f22608fd92c44be2447a6505141a8a867> was
introduced in the library. Before this change, we did not notice any
performance degradation. I compared buffer size before and after the
change, screenshot attached here. How do you think we can proceed from
here for fixing this issue?
Did you do the things that were recommended, did you try the latest
version and did you then bisect that version? If you revert that commit,
what happens? What is your curl_version()?
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