X Consumes constant 90-99% CPU usage

Sergey Ostrovsky sostrovsky at snip.net
Sun Nov 19 14:37:16 PST 2000


"J.Smith" wrote:

> Hi there.
>
> I just downloaded and installed XFree86 4.01 from sources. However, X is
> very slow. Since I have a Athlon 600, 128 MB, and a Matrox Millenium G400
> 32Mb, I decided it couldnt be slow hardware, and I ran 'top'. 'top' shows X
> as using a constant 90-99% CPU usage. Even if I replace my window manager by
> twm, X still uses 90-99% CPU, so its not my window manager. When I boot into
> my Mandrake distro instead of LFS on the same system and run X from my
> Mandrake distro, it runs fine. So I guess its not faulty hardware either. I
> recompiled twice to see if something went wrong there, and even went through
> the trouble of downloading and installing the precompiled binarys from
> xfree86.org, but even that did not solve my problem. Only if I switch from X
> to a virtual console using ALT-Fxx, does the cpu usage of X drop down again
> to (almost) zero. And then as soon as I switch back to my X session, it goes
> all the way back up again and stays there. I am running the mga driver that
> comes with XFree86 401 and not the driver that Matrox supplies themselves
> for X.
>
> Does anyone know what could be going on here? I have no idea on where to
> start looking, or how to even start to troubleshoot this issue. If someone
> could give me a few pointers here, that would be greatly appreciated.
> Thanks.
>
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It looks like really weird problem. Why don't you try to use Matrox-supplied
driver just to see what happens ?

John Kennedy, Sr.



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