Re: [Jfs-discussion] performance probs - 2.4.28, jsf117, raid5

[Per J. <pe...@co...>]

On Mon, 6 Dec 2004 17:37:30 -0500, Sonny Rao wrote:

>Right, so there's really only one thing i can think of and it's not
>much of a solution.  You can change the memory split so that you can
>use all 2gb for kernel memory.  I know there are some patches floating
>around to convert the 1GB to a 2GB split, or you can use one of the
>so-called 4GB/4GB kernels which keeps the kernel in a totally
>different address space.  

This is separate to the option for high-mem support in the kernel? 
OK, I've just found the posting from Ingo Molnar.  

>It's really only a solution if all of the inodes in your working set
>fit into 2GB, otherwise you're just delaying the inevitable.
>Ultimately, this is what 64bit machines (with a lot of ram) are good
>for :-) 

Yeah ...

thanks again.  I've managed to tweak our setup, which has helped - but the
problem is that kswapd when under heavy load manages to bring the machine
to a halt as other processes appear to be spinning.  I'm now contemplating
offloading a lot of this IO to another box - fortunately 32bit boxes are
cheap to come by these days. 


/Per Jessen, Zurich

-- 
regards,
Per Jessen, Zurich
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