Re: kernel performance update - 2.6.14

[jmerkey <jmerkey@utah-nac.org>]

jmerkey wrote:

> Nick Piggin wrote:
>
> > Jeff V. Merkey wrote:
> >
> > > Verified. These numbers reflect my measurements as well. I have not 
> > > moved off 2.6.9 to newer kernels on shipping products due to these 
> > > issues. There are also serious stability issues as well, though 
> > > 2.6.14 seems a little better than than previous kernels. Jeff
> >
> > These issues aren't going to fix themselves. Did you investigate
> > any of the performance or (more importantly) stability problems?
Added a little more clarification.

Jeff

> Yes I did. The list wasn't too long. I had problems with RCU messages 
> and irq warn messages at very high loads and init respawning itself 
> subjected to loads > 369 MB/S to the disk channels on 2.6.13. 
> Performance was down on disk I/O [vs.] 2.6.9. I did not investigate 
> the BIO fixes but something changed there. Theres also some memory 
> problems with corruption somewhere in the 2.6.14 (during module unload 
> and shutdown).
>
> Jeff

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