So I upgraded libssh2 to the newest version (1.7.0) but now I can't even connect to a SFTP server and got this error: "Failed initialization: Failure establishing ssh session"
To remind, I work with libcurl 7.47.1 and I managed to connect SFTP servers with libssh2 1.4.1. Now after the upgrade to 1.7.0, I can't anymore. Are there any known issues/changes we need to do in order to make them work together? Thanks! On Sun, May 15, 2016 at 3:27 PM, Moti Avrahami <[email protected]> wrote: > I measure a downgrade of more 35% download time. > I tried also to enlarge the CURL_MAX_WRITE_SIZE to 256K - 4MB but it > doesn't improve the times. > I am trying now to upgrade libssh2 to 1.7.0. Although I encounter some > compilation errors (is there a specific Visual Studio version that is > recommended for it?) I feel it will take me less time than trying to find > the problem during debugging. > > Thanks, > > On Sun, May 15, 2016 at 12:45 PM, Daniel Stenberg <[email protected]> wrote: > >> On Sun, 15 May 2016, Moti Avrahami wrote: >> >> I recently upgraded my libcurl version from 7.19.4 to 7.47.1 and I >>> noticed that there is a performance downgrade when downloading files from >>> SFTP servers than the older libcurl version. >>> >>> I checked both versions against the same SFTP servers. >>> >>> I use libssh2 version 1.4.1. >>> >>> Does anyone know what is reason and how can I fix it? >>> >> >> I don't know the reason. But you're doing a *massive* upgrade bump so >> almost everything has been changed internally. Clearly at some point the >> SFTP performance got worse. How big is the speed difference you measure? >> What's the latency to the server in your test case? >> >> You're also using an outdated libssh2 version. It has improved through >> time and modern versions should be faster and more reliable. >> >> The way to track this down is through good old fashioned debugging. You >> can possibly bisect yourself to the actual offending commit (assuming it >> was a single specific one) and based on knowing which change it was we can >> perhaps find the culprit/explanation faster. >> >> I've written about (poor) SFTP performance in libcurl several times in >> the past and we have ideas on how it could be increased significantly, but >> unfortunately nobody has yet actually converted any of those thoughts into >> reality. One such mention is here: >> https://curl.haxx.se/docs/todo.html#Modified_buffer_size_approach >> >> -- >> >> / daniel.haxx.se >> ------------------------------------------------------------------- >> List admin: https://cool.haxx.se/list/listinfo/curl-library >> Etiquette: https://curl.haxx.se/mail/etiquette.html > > >
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