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From:	<ianpul01 AT gmail DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	RE: X11 forwarding extremely slow (unusable) after Cygwin upgrade (starting from cygwin1.dll version 3.1.0-0.4)
Date:	Thu, 2 Jan 2020 13:25:51 -0800
Message-ID:	<013c01d5c1b3$35d44c30$a17ce490$@gmail.com>
MIME-Version:	1.0
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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: ianpul01 AT gmail DOT com <ianpul01 AT gmail DOT 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: ianpul01 AT gmail DOT com <ianpul01 AT gmail DOT 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-owner AT cygwin DOT com <cygwin-owner AT cygwin DOT 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
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