On 2007-05-21, Hans-Werner Hilse <[EMAIL PROTECTED]> wrote:
> Hi,
>
> On Mon, 21 May 2007 17:22:39 +0000 (UTC) Grant Edwards
><[EMAIL PROTECTED]> wrote:
>
>> > However, the usual way to use remote X-based programs is just to let
>> > SSH do that. It can provide a tunnel for X. This is especially easy
>> > if the remote SSH server daemon has set its "X11Forwarding"
>> > configuration setting set to "yes" (otherwise, it is really a bit
>> > harder and not suggested). Then, you just would connect using "ssh
>> > -X [EMAIL PROTECTED]" and that's it, SSH will care for creating a socket on
>> > the remote machine and set the DISPLAY variable accordingly.
>>
>> NB: I've found that using -Y instead of -X can speed up some
>> applications by a factor of 50 or more.
>
> well, I don't doubt you did experience it, but it sounds quite
> unlikely (or like a bug). To be a bit picky: How did you
> measure that factor?
With a stopwatch. I timed how long the initial window took to
draw, how long it took to redraw after an expose event, how
long a dialog box took to appear, etc. Using -X, the times
were 1-2 minutes. Using -Y, they were was 1-3 seconds.
This was through a 1Mbps link with about 40ms of latency.
> But you're right: In fact, some applications will probably work better
> in "trusted" mode (see "ForwardX11" in ssh_config(5)). However, usually
> applications are not supposed to behave in a way where -Y (i.e.
> trusting all and everything) has improvements...
It made a big difference on all apps I tested, and a _huge_
difference on GTK apps. The improvement on GTK apps was
probably 10X the improvement for Motif or Athena apps.
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