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Roberto Deandrea edited comment on SSHD-1217 at 10/26/21, 9:14 AM: ------------------------------------------------------------------- Hi Thomas, The trace I've attached are at finer level (setting org.apache.sshd.*=finer).* I've attached new traces at finest level (setting org.apache.sshd.*=*finest*). With these traces the client sftp code inside the front-end server is very well traced. Maybe I'm stupid about SFTP but I don't know ho to answer your question; the front-end has an SftpFileSystemProvider configured to proxy remote sftp traffic to a backend Apache SSHD server. The client used is a Linux OpenSSH sftp client (OpenSSH_7.1p2, OpenSSL 1.0.2g 1 Mar 2016) issuing the "ls" command. Kind Regards Roberto was (Author: roberto.deandrea): Hi Thomas, The trace I've attached are at finer level (setting org.apache.sshd.*=finer). I've attached new traces at finest level (setting org.apache.sshd.*=finest). With these traces the client sftp code inside the front-end server is very well traced. Maybe I'm stupid about SFTP but I don't know ho to answer your question; the front-end has an SftpFileSystemProvider configured to proxy remote sftp traffic to a backend Apache SSHD server. The client used is a Linux OpenSSH sftp client (OpenSSH_7.1p2, OpenSSL 1.0.2g 1 Mar 2016) issuing the "ls" command. Kind Regards Roberto > Slow performance listing huge number of files on Apache SSHD server > ------------------------------------------------------------------- > > Key: SSHD-1217 > URL: https://issues.apache.org/jira/browse/SSHD-1217 > Project: MINA SSHD > Issue Type: Improvement > Affects Versions: 2.6.0 > Reporter: Roberto Deandrea > Priority: Minor > Attachments: trace.ssh-frontend-sftplist.finest.log.zip > > > Hi Thomas, > I noted slow performance listing files on the front-end Apache SSHD server in > the same scenario as https://issues.apache.org/jira/browse/SSHD-1215 > The front-end Apache SSHD server is configured with a Filesystem built upon > SFTPFileSystemProvider to proxy files to an Apache SSHD back-end server. > > In the /inbox folder of the Apache SSHD backend server I have 2000 files. > The client sftp ls commands take 2 secs on the backend Apache SSHD server, > instead it takes about 48 secs on the front-end Apache SSHD server. > For greater number of files in the /inbox folder times are getting worse. > > I have full traces of sftp list commands to front-end Apache SSHD server > that is attached to this jira.[^trace.frontend.sshd.log.zip] > I looked through the traces on the front-end server and it seems to me that > for every files in the folder the sftp client on the front-end server creates > a SSH_MSG_CHANNEL_DATA generating tcp traffic that slow down the performance > of the list command. > Obviously this does not happen when a sftp client connects directly to the > backend Apache SSHD server. > Can you take a look at traces on the front-end Apache SSHD server ? > Do you think it's possbile change something to improve performance of list > files in this situation ? > > Thanks in advance > > Kind Regards > Roberto > > > -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@mina.apache.org For additional commands, e-mail: dev-h...@mina.apache.org