[CentOS] Very slow on I/O?

>> Just one more piece of information: a simple recompile isn't what  
>> has fixed the problem every time, the recompile has involved an  
>> upgrade to 2.6.16 as well
> There is a bad patch to the vm that makes the box use swap even  
> when there is free RAM space available. Maybe that is what you are  
> seeing.

I don't think so, swap usage is only 440k

> The fix will be in the 4.4 release kernel.

What kernel version will be in 4.4? I can look this up myself too if  
someone can kindly give me a pointer :)