Linked by lopisaur on Fri 25th Jun 2010 22:21 UTC
Ubuntu, Kubuntu, Xubuntu Based upon a recent email to the X.Org developers' mailing list, Canonical is nearing the point of one of their goals for Ubuntu 10.10 of a rootless X Server, or being able to run the X.Org Server without root privileges.
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RE[7]: Big deal...
by Savior on Sat 26th Jun 2010 22:09 UTC in reply to "RE[6]: Big deal..."
Savior
Member since:
2006-09-02

Don't make things up. The CFS scheduler is quite good and has no problems with interactivity on the desktop.

No, he is right. Compiling is OK, but just try to uncompress an 1G rar file or copy some files in the background and the GUI will come to a crawl. Not just the GUI, actually: CLI programs like vim are affected too. CFS is horrible for the desktop.

And I experience this both on my Core2Duo home computer and at my workplace on an 8-CPU beast, so the problem is definitely there.

Reply Parent Score: 2

RE[8]: Big deal...
by phoenix on Sat 26th Jun 2010 22:57 in reply to "RE[7]: Big deal..."
phoenix Member since:
2005-07-11

An even simpler way to reproduce the issue is to use dd.

dd if=/dev/urandom of=/somefile bs=1M count=10000 can cause an X11 GUI (KDE, GNOME, Xfce, etc) on Linux to slow down to a crawl until the dd is done. Doing the same with a USB drive makes it even more noticeable.

The same test on a non-Linux system will not affect X11, though.

Reply Parent Score: 2

RE[9]: Big deal...
by Zifre on Sun 27th Jun 2010 01:07 in reply to "RE[8]: Big deal..."
Zifre Member since:
2009-10-04

I'm not sure where you're getting this...

I just ran in this command:

dd if=/dev/urandom of=test bs=1M count=10000

on Ubuntu 10.04 on a Core i3 530, which is relatively slow. I noticed no decrease in responsiveness whatsoever. I even tried playing an OpenGL game. The FPS dropped by a few frames, but it was not choppy or unresponsive at all.

Maybe it's just your particular system that has problems?

(Note: I'm not trying to say that there is a problem with X11. I'm saying that the problem doesn't exist, in Linux or X11.)

Reply Parent Score: 2

RE[8]: Big deal...
by Elv13 on Sun 27th Jun 2010 03:01 in reply to "RE[7]: Big deal..."
Elv13 Member since:
2006-06-12

It is an official Linux kernel bug affecting 15% of x86_64 installting. It is not the scheduler, the kernel just fail to do it's job. Linus tried to solve it but failed, many other tried too.

My desktop is affected by the bug, my Laptop is not. It depend on the chipsset and some hardware parts, but is due to their drivers.

Reply Parent Score: 2