Now narrowed down to cygwin1.dll version 3.1.0-0.4 as the release which introduced this issue.
I found the intervening versions between 3.0.7-1 and 3.1.0-1 as test releases in earlier release archives at crouchingtigerhiddenfruitbat.org, so incrementally installing those from 3.1.0-0.1, I found that with cygwin1.dll version 3.1.0-0.3 X11 forwarding works fine, with 3.1.0-0.4 it is extremely slow (unusably slow for CPU-intensive programs). Ian > -----Original Message----- > From: ianpu...@gmail.com <ianpu...@gmail.com> > Sent: Thursday, January 2, 2020 11:17 AM > > Hi. > > I don't know if this will help at all since there is a big time gap and it looks like > a lot of changes between these, but I tried the cygwin1 dlls from the > snapshots at https://www.cygwin.com/snapshots and found that the 2019- > 08-19 snapshot works fine, the next one dated 2019-11-03 introduces the > issue. > > Someone told me offline that there were about half a dozen released > versions between 3.0.7-1 and 3.1.0-1, but those are not available to pull > from any of the mirrors that I tried. Anyone know if any of those > intermediate versions of cygwin1.dll may be available somewhere from > which I can grab them to try to narrow this down further? > > Ian > > > -----Original Message----- > > From: ianpu...@gmail.com <ianpu...@gmail.com> > > Sent: Wednesday, January 1, 2020 12:41 AM > > > > The problem is with cygwin 3.1.0-1, released on Dec 16th, or thereabouts. > > > > I decided to track it down by re-installing the earlier working > > release from the Cygwin time machine at > > crouchingtigerhiddenfruitbat.org, and then incrementally upgrading it > > until the problem showed up. It turns out that it was introduced in > > the Dec 16th release, which made just one change - upgraded cygwin > > from 3.0.7-1 to 3.1.0-1. With the Dec 15th release all works fine - > > nice fast response in the X11 windows, with the Dec 16th release the same > programs in X11 windows are really, really slow. > > > > I can roll cygwin back to 3.0.7-1 from the latter release and X.11 > > then works fine again. > > > > To quantify the problem, I timed these using the BeyondCompare and > > kdiff3 file diff programs (which really show up the issue being very > > CPU intensive) comparing two versions of a source code directory > > containing 6 largish files, all differing: > > > > Time to open the window and display the directory: > > > > BeyondCompare with cygwin 3.0.7-1: 2 seconds, with cygwin 3.1.0-1: > > 18 seconds. > > Kdiff3 with cygwin 3.0.7.1: 4 seconds with cygwin 3.1.0-1: > > 15 seconds. > > > > Time to open a tab and display the diffs for one of the files: > > > > BeyondCompare with cygwin 3.0.7-1: 1 seconds, with cygwin 3.1.0-1: > > 8 seconds. > > Kdiff3 with cygwin 3.0.7.1: 5 seconds with cygwin 3.1.0-1: > > 13 seconds. > > > > Firefox is not so bad, but still slower. The time to open the window > > and display the default home page is about 2 seconds with cygwin > > 3.0.7-1, 5 seconds with 3.1.0-1. And the problem that I reported below > > relating to slow response trying to type into Firefox's address bar is > > not showing up with this build. Either that was introduced later, or > > maybe it was some side effect of the upgrade path that I took then? > > > > Ian > > > > > -----Original Message----- > > > From: cygwin-ow...@cygwin.com <cygwin-ow...@cygwin.com> On > > Behalf Of > > > Ian Puleston > > > Sent: Friday, December 27, 2019 4:39 PM > > > > > > Hi, > > > > > > I have a Cygwin installation on a Windows 10 PC, on which I use > > > X-Windows to access a Linux development/build server. All has been > > > working great for a long time, until I rand a Cygwin upgrade on > > > December 23rd, and after that > > > X11 has become pretty much unusable. I normally launch the > > > terminator terminal emulator locally under X, in that I "ssh -Y" to > > > the Linux machine, and then on there I use a number of GUI apps, > > > mainly SlickEdit and BeyondCompare, which run remotely via X11 > > > forwarding to display in windows on my local Windows PC. But since > > > this Cygwin upgrade all of those remote X11 apps are now extremely > > > slow to respond to anything - about 10 to 20 seconds to action any > > > key press or mouse > > click. > > > > > > The two machines are on the same Gig-Ethernet LAN segment so there > > > are no latency issues there (ping response time <1mS). > > > > > > To take any possible problems with those components out of the > > > picture, I tried instead launching xterm under X11 locally, and from > > > it launching Firefox after ssh to the Linux machine, and again I see > > > the same symptoms with that > > > - trying to type into Firefox's address bar takes about 10 seconds per > letter. > > > > > > I had previously updated my Cygwin installation on March 3rd 2019, > > > so this problem has come in sometime between then and now. I've just > > > spent a very long day and a half rolling back the changes as much as > > > I could (by hacking the setup.ini and re-installing previous > > > versions from the local download > > > cache) and eventually managed to get a working hybrid with enough > > > packages rolled back to make the difference, and now X11 is working > > > fine again. > > > > > > I also tried a new clean install of the latest Cygwin, after > > > deleting my .XWinrc and removing all but the bare minimum from > > > .startxwinrc, and do see the problem with that too. > > > > > > Is this any known problem? I couldn't find anything obvious in the > > > email archives. > > > > > > Ian > > > > > > -- > > > Problem reports: http://cygwin.com/problems.html > > > FAQ: http://cygwin.com/faq/ > > > Documentation: http://cygwin.com/docs.html > > > Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
