Re: Poor interactive response from the FC2 kernel on SMP hardware?

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Well, here's another data point.  I left the stack at 4k when recompiling the stock kernel (I'm not using the nvidia drivers, so I figured I'd leave as much as is) so I don't think that's the cause.

I have been much happier with the behavior of the stock kernel than the one redhat/FC supplied - though the test cycle has been less than 24 hours.  I'll see how I feel a few days from now.

For posterity (the list archive) I'm running

2x PIII 1Ghz
512M RAM
ATI Radeon 9600XT (w/ the ATI drivers)
Blah, blah, blah (as you so succinctly put it ;))

On Thu, 2004-05-20 at 23:51 -0700, Benjamin Arai wrote:
I had some of the same issues but reduced a lot of them by setting the default stack size back to 8k.  Fedora set it to 4k mainly to help javas performance and that was about it.  Also, the inconsistencies you are experiencing with applications may be for the same reason.  I am using a dual and it seemed to work fine after re-compiling a vanilla kernel.

Another possibility is that Fedora uses there own asynchronous I/O patch, which may conflict with the new 2.6 kernels scheduler.

My machine that worked:
    - 2x Athlon MP
    - 2GB Registered RAM
    - NVIDIA ...
    - Blah blah blah
    - ...

These are all guesses...

On Thu, 2004-05-20 at 21:48, Dan Berger wrote:
Folks - I've been running FC1 with a home-build (stock) 2.6.X kernel for several months without issue. 

I upgraded to FC2 the other night and was immediately struck by the poor interactive performance of the system.  Audio (Ogg) played via rythmbox skips and stutters during I/O, the GUI pauses for "long" periods (where long is > 0), etc.

I just built a stock 2.6.6 kernel using the i686 smp config file shipped with FC2, and performance is much improved.  (I'm typing this, listening to music, and doing a make clean on the kernel tree with no stuttering.)

Have others seen this issue?  Is it known?  A search of this list didn't turn up anything that clearly matched, nor did a search of RH Bugzilla.

Cheers.


--

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