A question about "Software rendering for gnome-shell"
michal at harddata.com
Tue Feb 21 23:35:15 UTC 2012
On Tue, Feb 21, 2012 at 05:12:13PM -0500, Adam Jackson wrote:
> On Tue, 2012-02-21 at 13:10 -0700, Michal Jaegermann wrote:
> > Running 'LIBGL_ALWAYS_SOFTWARE=1 gnome-shell --replace', as proposed by
> > drago01, indeed starts an intended mode gnome session, both before and
> > after installing these scratch packages, but results are spectacularly
> > useless. 'gnome-shells' eats whatever CPU it can get so one can look at
> > results but no hope of doing anything useful.
> CPU usage is going to be higher. That's what "software rendering"
> means. I've not found it onerous on an early c2d, but again, I really
> need to know what kind of CPU is being complained about.
This particular one is a 64-bit (albeit quite old) processor:
vendor_id : AuthenticAMD
cpu family : 15
model : 5
model name : AMD Opteron(tm) Processor 142
stepping : 1
cpu MHz : 1600.062
cache size : 1024 KB
on a board with 2GB of a physical memory. I know some machines around,
and doing useful job, where this is a quite powerhouse in a comparison.
When forced with LIBGL_ALWAYS_SOFTWARE=1 gnome shell was taking all the
time between 94% and 96% of CPU and a response latency for a keystroke
or a mouse movement was in a order of few seconds. My guess is that
more of CPU would be grabbed if only it would be available. At the
first moment I thought that the whole thing just locked up and only
after some delay I realized that I was mistaken.
I have no idea how much this CPU usage would have to be reduced before
this setup would pass a "laugh test" but probably 10% for gnome-shell
would be way too much.
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