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https://issues.apache.org/jira/browse/SSHD-979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17088661#comment-17088661
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Guillaume Nodet commented on SSHD-979:
--------------------------------------

The problems I fixed are in the client.  But you're right, upload/download 
times can be but by 100 easily with the new code in some scenarii. 

Both could also marginally benefit from SSHD-981, but it's not widely 
implemented.

> Rework SFTP streams so that we can send or receive as much data as possible
> ---------------------------------------------------------------------------
>
>                 Key: SSHD-979
>                 URL: https://issues.apache.org/jira/browse/SSHD-979
>             Project: MINA SSHD
>          Issue Type: Improvement
>            Reporter: Guillaume Nodet
>            Assignee: Guillaume Nodet
>            Priority: Major
>             Fix For: 2.5.0
>
>   Original Estimate: 120h
>  Remaining Estimate: 120h
>
> The streams use a synchronous InputStream or OutputStream on the channel 
> which blocks for the server response whenever flush is called.  This cause a 
> huge drop of the transfer rate compared to other SFTP implementations.
>  
> This work is sponsored by Buddy [https://buddy.works/]



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