Am 17.09.2011 03:39, schrieb John A. Sullivan III: > On Fri, 2011-09-16 at 23:17 +0200, Mike Gabriel wrote: >> Hi John, hi Alex, >> >> On Fr 16 Sep 2011 21:56:38 CEST "John A. Sullivan III" wrote: >> >>> Hello, all. Since moving to the newer clients using libssh, I've >>> noticed what appears to be a performance degradation. It smells like >>> Nagle coalescing packets, e.g., most of the screen will paint, then it >>> will pause a moment, and then the rest will paint. Is there any chance >>> we have neglected to disable Nagle when invoking libssh? >>> >>> This appears to have affected the SNMP over SSH project: >>> http://books.google.com/books?id=S62is2vVoVgC&pg=PA29&lpg=PA29&dq=libssh >>> +nagle&source=bl&ots=F8Iw-pvQxd&sig=f5dfy0K0ewzSZOhqzTJRSKsDKZ8&hl=en&ei=KppzTrCZD4LJgQeMxLzzDA&sa=X&oi=book_result&ct=result&resnum=1&sqi=2&ved=0CBwQ6AEwAA#v=onepage&q=libssh%20nagle&f=false >>> >>> This is in section 4.1. The difference was a latency of over 800ms to >>> one of under 60ms. That seems to be about what I am seeing. There is a >>> delay of roughly a second and then the rest of the screen comes through. >>> Thanks - John >> >> Indeed the TCP_NODELAY (which means: turn Nagle off) is not set for >> the ssh tunnel in X2goClient. It probably is for the SSH connection >> itself, as the SNMP patch has been reported to libssh upstream and >> their patch suggestion has been sensible. However, for the SSH tunnels >> built up for X2go this TCP_NODELAY option does perhaps not get set. >> >> @Alex: would this patch fix that in x2goclient??? >> >> diff --git a/sshprocess.cpp b/sshprocess.cpp >> index 9e72e8f..03ee9b6 100644 >> --- a/sshprocess.cpp >> +++ b/sshprocess.cpp >> @@ -88,6 +88,7 @@ void SshProcess::tunnelLoop() >> const char y=1; >> #endif >> setsockopt(serverSocket, SOL_SOCKET, SO_REUSEADDR,&y, sizeof(int)); >> + setsockopt(serverSocket, IPPROTO_TCP, TCP_NODELAY,&y, sizeof(int)); >> >> address.sin_family=AF_INET; >> address.sin_addr.s_addr=INADDR_ANY;
I don't think that that can be helpful. This part of code is only for reverse tunnel which is used for FS forwarding and Pulse Audio. >> >> @John: could you get the latest sources of x2goclient from our Git: >> >> git clone git://code.x2go.org/x2goclient.git >> >> and run debuild -uc -us (plus fullfill build-deps before) on a Debian >> squeeze or above system and check if the patch fixes your delays??? >> >> Best+Thanks, >> Mike > <snip> > Hmm . . . I wonder if this explains why the Windows client performance > is so much worse than Linux. I assumed it was an X to GDI translation > issue but the symptoms I described in scrolling through Evolution mail > are press several keystrokes and one actions, then a long pause, then > the rest of the keystrokes follow as if they've been buffered - John > > _______________________________________________ > X2go-Dev mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/x2go-dev I can imagine, that it can be problem in libssh on Windows. Can you try to build a new libssh.dll on your system? However, I still cannot reproduce your issue on my windows client :( regards, Alex -- Oleksandr Shneyder Dipl. Informatik X2go Core Developer Team email: [email protected] web: www.obviously-nice.de --> X2go - everywhere@home
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