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Avenger

Member

Registered: 2005-11-11

Posts: 65

Chromium makes X use 100% cpu while scrolling

I'm having issues running chromium on my computer, when ever I scroll a webpage X rushes to 100% cpu usage and everything lags.
This makes the scrolling very jerky and very annoying. I do not see this behavior in any other browsers, but I have seen high X cpu usage in other scenarios
like large terminal outputs  in urxvt.

I'm running testing with the OSS radeon driver with KMS on a Radeon 9800 PRO (R350) AGP, on a AMD A64 3000+. I'm leaning towards this being a radeon driver
as I've had issues with it before. I tried to pull build the DDX from git but it didn't change anything.

Any suggestions?

Cyrusm

Member

From: Bozeman, MT

Registered: 2007-11-15

Posts: 1,053

Re: Chromium makes X use 100% cpu while scrolling

what happens if you disable KMS?  It also sounds to me like this is most likely a graphics driver problem, and from what I understand KMS+Radeon can have some issues (however I haven't used KMS in a long time, so I'm not sure if the situation has improved at all)

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Hofstadter's Law:
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karol

Archivist

Registered: 2009-05-06

Posts: 25,440

Re: Chromium makes X use 100% cpu while scrolling

https://bugs.launchpad.net/ubuntu/+sour … bug/567271
http://bugs.archlinux.org/task/19224

The above are just pointers: it can be some extension, a bug in xorg or a memory leak in chromium or ...

Last edited by karol (2010-04-30 15:57:36)

kokoko3k

Member

Registered: 2008-11-14

Posts: 2,397

Re: Chromium makes X use 100% cpu while scrolling

Also, changing WindowManager or disabling compositing could help.

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Avenger

Member

Registered: 2005-11-11

Posts: 65

Re: Chromium makes X use 100% cpu while scrolling

I'll try with UMS, but I've had corruption issues with KMS off for quite some time now. The current window manager i use is KDE and I don't use compositing, but I'll try some different variations.

Edit:
Trying UMS seems to fix the slowdown issue, however I now how some corruption on the taskbar/icons in kde and tabing back and forth between windows gives corruption to the contents inside.
Oh, and trying to turn on compositing with UMS gives me a segfault in X:

[   668.275] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80deeab]
[   668.275] 1: /usr/bin/X (0x8048000+0x63c25) [0x80abc25]
[   668.275] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb775140c]
[   668.275] 3: /usr/lib/xorg/modules/extensions/libglx.so (0xb7353000+0x38b2c) [0xb738bb2c]
[   668.275] 4: /usr/lib/xorg/modules/extensions/libglx.so (0xb7353000+0x41728) [0xb7394728]
[   668.275] 5: /usr/lib/xorg/modules/extensions/libglx.so (0xb7353000+0x37818) [0xb738a818]
[   668.276] 6: /usr/bin/X (FreeResource+0xed) [0x806dbad]
[   668.276] 7: /usr/lib/xorg/modules/extensions/libglx.so (0xb7353000+0x32bf0) [0xb7385bf0]
[   668.276] 8: /usr/lib/xorg/modules/extensions/libglx.so (0xb7353000+0x375cf) [0xb738a5cf]
[   668.276] 9: /usr/bin/X (0x8048000+0x216df) [0x80696df]
[   668.276] 10: /usr/bin/X (0x8048000+0x1a485) [0x8062485]
[   668.276] 11: /lib/libc.so.6 (__libc_start_main+0xe6) [0xb747fb96]
[   668.276] 12: /usr/bin/X (0x8048000+0x1a071) [0x8062071]
[   668.276] Segmentation fault at address 0x87

Edit 2:
Looks like the chromium problem it self isn't entirely gone, when dragging the scrollbar fast with the mouse X still reaches 100% cpu usage compared to other browers who would peak at ~20-40%. I just wasn't able to get it to 100 with the mouse wheel. The slowdown is still pretty noticeable in chromium when dragging.

Last edited by Avenger (2010-04-30 19:14:55)

karol

Archivist

Registered: 2009-05-06

Posts: 25,440

Re: Chromium makes X use 100% cpu while scrolling

Do you experience those problems even when running only bare chromium (no other apps, no chromium extensions)?

Avenger

Member

Registered: 2005-11-11

Posts: 65

Re: Chromium makes X use 100% cpu while scrolling

It's is less noticeable with only chromium running, but the base problem is still there. X CPU usage skyrockets and the whole application feels 'jerky'.

karol

Archivist

Registered: 2009-05-06

Posts: 25,440

Re: Chromium makes X use 100% cpu while scrolling

Your gear is not top of the line and KDE is quite demanding. Some people use -ck kernel as a cure for jerkyness - try it out and report back here.

Avenger

Member

Registered: 2005-11-11

Posts: 65

Re: Chromium makes X use 100% cpu while scrolling

If that is what is going to take, I'll just drop chromium
I'm running opera now with no performance hits and I'm actually quite happy with it. I really just wanted to see what the chromium fuzz was about.