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Re: Cygwin terminal weirdness
- From: Andrey Repin <anrdaemon at yandex dot ru>
- To: Warren Young <wyml at etr-usa dot com>, cygwin at cygwin dot com
- Date: Tue, 15 Sep 2015 06:54:25 +0300
- Subject: Re: Cygwin terminal weirdness
- Authentication-results: sourceware.org; auth=none
- References: <91152470 dot 20150913213611 at yandex dot ru> <7AF4498C-6FE4-4541-9CAD-03EC3D867D72 at etr-usa dot com>
- Reply-to: cygwin at cygwin dot com
Greetings, Warren Young!
>> Call "man" on a sufficiently long topic. man bash would be quite sufficient.
>> Or just `less` a long enough text.
>> Hold down "End" key.
>> The screen buffer will jump and tear repeatedly, until you release the key.
> That sounds like a video card performance issue, not a Cygwin, mintty, or less issue.
I can't believe it is a gfx performance issue, as I can't reproduce it with
PuTTY in the same situation.
native console/local less = jumping and tearing.
mintty/local less = jumping and tearing.
native console/ssh+less = jumping and tearing.
mintty/ssh+less = jumping and tearing.
putty+less = no jumping, no tearing.
Let's try a different approach. The video id is ne3VmLZmD9g on a well-known
tube hosting service.
> I just tried it here on a VM hosted on a box with an NVIDIA GeForce GTX
> 680MX GPU, and all I saw was normal redrawing, with scarcely any tearing.
> That chip is about 3 years old, which probably still outperforms any current CPU-integrated GPU.
> There are some small mitigations that might help.
> One would be to convince the maintainers of less to be smarter about
> repainting the whole screen when it isnât necessary. But given that they
> havenât fixed the horizontal scrolling bug in the ~20 years Iâve been using
> it, I wouldnât hold out hope on that front.
Well, let's say, this is unconvincing.
> Another would be to make mintty double-buffer its screen, if it doesnât
> already. That wonât help with the clear-screen call less is currently
> making, but it might reduce the tearing effect.
> The same thing is happening with something like âls -lR /â. The only
> difference is that you can easily see whatâs going on in the âman bashâ
> case, since the content remains static.
> Another way to see it is âvim /etc/sshd_configâ, then hold down Ctrl-L.
I'm not familiar with vi/m, so I'll just trust you on the matter.
With best regards,
Tuesday, September 15, 2015 06:47:19
Sorry for my terrible english...