Bugs item #1538093, was opened at 2006-08-10 16:24 Message generated for change (Comment added) made by bagder You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=703942&aid=1538093&group_id=125852
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None >Status: Closed >Resolution: Invalid Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: Slow Transfer Speeds Initial Comment: Hi. Using ssh on high-speed internet links can see poor performance with TCP Window size adjustments. For openssh, there is a workaround for this slow speed, which increases the window size inside of the channel: If you are using openssh-3.5pl, the line to change is 119 of channels.h. Change value of CHAN_SES_WINDOW_DEFAULT from 4*CHAN_SES_PACKET_DEFAULT to 100*CHAN_SES_PACKET_DEFAULT. Below is an excerpt from an updated channels.h, with the change indicated in red: #define CHAN_EXTENDED_IGNORE 0 #define CHAN_EXTENDED_READ 1 #define CHAN_EXTENDED_WRITE 2 /* default window/packet sizes for tcp/x11-fwd-channel */ #define CHAN_SES_PACKET_DEFAULT (32*1024) #define CHAN_SES_WINDOW_DEFAULT (100*CHAN_SES_PACKET_DEFAULT) /*? ORBITAL: changed from 4 to 100 */ #define CHAN_TCP_PACKET_DEFAULT (32*1024) #define CHAN_TCP_WINDOW_DEFAULT (4*CHAN_TCP_PACKET_DEFAULT) #define CHAN_X11_PACKET_DEFAULT (16*1024) #define CHAN_X11_WINDOW_DEFAULT (4*CHAN_X11_PACKET_DEFAULT) However, I cannot find a similar place inside of libssh2's codebase to make a change that will work along these lines. I have tried changing LIBSSH2_CHANNEL_WINDOW_DEFAULT LIBSSH2_CHANNEL_PACKET_DEFAULT with no success. ---------------------------------------------------------------------- >Comment By: Daniel Stenberg (bagder) Date: 2007-12-03 12:10 Message: Logged In: YES user_id=1110 Originator: NO Slow transfers aren't really a bug in libssh2 but unfortunately still mostly a design-issue. I don't see how any references to openssh helps us, nor do I believe it has to do with the TCP window size. I would not be surprised however if the SSH window size is involved. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=703942&aid=1538093&group_id=125852 ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ libssh2-devel mailing list libssh2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libssh2-devel
