Hi again,
I have enabled trace and gets a bunch of
[libssh2] 4.816541 SFTP: Marking request ID 63 as a zombie request
[libssh2] 4.816541 SFTP: Marking request ID 64 as a zombie request
[libssh2] 4.816541 SFTP: Marking request ID 65 as a zombie request
up to ID 266. I don't see any ID on the packages received, just:
[libssh2] 0.675533 SFTP: Received packet 103 (len 2009)
and then some
[libssh2] 4.826541 SFTP: recv packet
[libssh2] 4.826541 SFTP: Data begin - Packet Length: 28
[libssh2] 4.826541 SFTP: Received packet 101 (len 28)
[libssh2] 4.826541 SFTP: Removing request ID 63 from the list of zombie
requests
The code to read is:
do {
/* read in a loop until we block */
rc = libssh2_sftp_read(sftp_handle, mem, amount);
NOTE("libssh2_sftp_read returned %d\n", rc);
if(rc > 0) {
fwrite(mem, 1, rc, local);
got += rc;
NOTE("got = %d\n", got);
}
} while (rc > 0);
and I get 2000 bytes each time. The testfile is 116K.
Any thoughts? I will try to dig into the sftp-code...
/Lars
On 2015-03-23 14:52, Lars Nordin wrote:
Hi,
I'm using libssh2 for different purpose, one of them is write/read
files using SFTP. I just start using version 1.5.0 and I can't get the
SFTP-read up to speed. I'm testing with a 76M file and using SecureCRT
SFTP I get 81s for the download, with libssh2 SFTP 44 minutes!!!
If a use SCP I get download in 12s!!
The libssh2_sftp_read() always return 2000, despite I call it with a
buffer of 100k.
If a look at the network with wireshark and compare the data on the
network, I notice that
o with SecureCRT SFTP the server send data in 1460 sized packages,
at least 10 packets before the client send some data (up to 32 packets
I notice)
o with libssh2 the server send data in different sizes (1460 and
less, many times 1460 followed by 592) and 1-4 packets before the
client send something.
The test is done using a OpenSSH sshd in a Linux virtual machine.
Client is Windows7
I copied the sftp_RW_nonblock example.
Can I change something?
/Lars
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