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DateFri, 28 Oct 2005 21:08:35 -0600
Fromjmerkey <>
SubjectRe: kernel performance update - 2.6.14
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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