Re: raw vs XFS sequential write and system load

[Mario Kadastik <mario.kadastik@xxxxxxx>]

Well to finally summarize, the things pointed out all helped too, but  
the major change in system behavior came from the fact that 2.6.23  
had totally different virtual memory defaults than 2.6.9 and running  
with 2.6.23 one has to change the dirty_ratio to something bigger to  
allow for a fast i/o machine to actually handle the load. Now the  
four nodes we have are all running very nicely and calmly and  
performing all the tasks we have asked from them, no more see we any  
congestion etc.

I have summarized my weeks of investigations into a twiki page,  
comments are welcome:

http://hep.kbfi.ee/index.php/IT/KernelTuning

Thanks for the help,

Mario