>> Ok thanks, I'm trying to understand this to see what can be
>> done about this to
>> improve libssh2 performance.
>>
>> What requests do libssh2 send that it waits for a response
>> to that the openssh
>> tools don't? I'm looking at the code for a simple SCP
>> download case, and I
>> don't see it.
>>
>> Can you be a bit more specific and mention exact protocol
>> details or perhaps
>> libssh2 source code functions/snippets that is the culprit
>> of this mentioned
>> restriction?
The most critical part is file transfer. Consider that you are
transferring a 2MB file, you send one request (libssh2_sftp_read,
SSH_FXP_READ) for 32kb of data. Then you wait for the response packet
(libssh2_sftp_packet_requirev, SSH_FXP_DATA, SSH_FXP_STATUS). Then you
send the request again and wait a while to get the response. And so on.
If the first request is successfull you could send three requests in a
row and then wait for the responses and data. If they are successfull,
then let's send 10 requests and wait for responses. This would consume
the bandwidth more efficiently as the bandwidth would be in use while
the server processes our request. This is what I mean with asynchronous
transfer.
This could be implemented by adding a full function that gets/puts one
file similarly to command line tools. Now that the API provides
read/write functions to get a certain amount of data we are bound to use
synchronous approach.
Hopefully this makes sense :-)
/jUSSi
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