Re: kernel performance update - 2.6.14

[jmerkey]

And one other item. Setting the build to preemptible kernel seems to 
improve I/O performance relative to 2.6.9, if you don't use it, the 
console has long periods where user processes are getting starved under 
extremely heavy I/O loads.

Jeff


jmerkey wrote:

> 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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