98772 - Image scaling performance on remote X connections horrid

Status: RESOLVED INCOMPLETE

(Core Graveyard :: Image: Painting, defect)

Description

[Randell Jesup [:jesup] (needinfo me)]

Mozilla 20010907xx  Linux RH7.1

On a remote X connection to a fast machine (dual-500's), from a fast machine
(800Mhz), over an ethernet link (10Mbps).

Move the mouse across the tabs (Home, ChipGeek, etc).  The menus are VERY slow
to come up, often paint in waves, and when you move the mouse over the menus the
highlighting is very slow.  Note that a jprof I ran of doing this didn't show a
lot of CPU use and hits, though some of the hits were surprising.  It appears to
be spending time doing image scaling and the like over X and generating a lot of
traffic.

The updates of the menus appear to be synchronized to the update of the anim ad
on the right, which appears to be scaled.  (Note that scaling shows up as a
major hit in the jprof).  In the realtime jprof, nsImageGTK::DrawScaled() showed
up as ~85% of the time (95% of that in select()), and is being called from
UpdateIdle().

Note: patch 93999 (including update) applied.

It may be there's no easy solution for this, but....

Comment 1

[Stuart Parmenter]

running at 10mbit is going to be pretty painful.. try 1000 ;)

Comment 2

[Roland Mainz]

Reporter, please try the Xlib port of Mozilla... it supports the X11 XIE (X
Image Extension) which moves the scaling job from Xclient (mozilla) to the
Xserver (assuming it supports the XIE extension) ...

Comment 3

[joki (gone)]

Not event handling

Comment 4

[Stuart Parmenter]

Moving bugs to new Image: GFX component

Comment 5

[Stuart Parmenter]

is this better now?  I don't have a linux machine to test this on, and it seems 
ok on solaris.  tor's previous changes should have sped this up a great deal.

Comment 6

[Randell Jesup [:jesup] (needinfo me)]

The testcase currently doesn't have a scaled ad.  Still seems a little sluggish
even without it.  I'll try to build a stand-alone testcase after I get back from
vacation;  Reassigning to me until then.  I'm not certain anything has gotten
better.