Re: kernel performance update - 2.6.14

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

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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