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Re: [linux-lvm] Apparent performance degradation for each PV with striping



On Monday 19 March 2001 06:20, Eric M. Hopper wrote:
> 	Have you played with hdparm to try to tune the way the kernel
> talks to your IDE drives?
>
> 	That may be the reason for being CPU bound.  The kernel tends to
> default to the slowest possible method because there are a lot of bad
> IDE controllers and drives out there that will trash your data if you
> try to talk to them in a way they aren't expecting.
>
> Have fun (if at all possible),

The 2.4.x kernels will turn on DMA and multi-mode at boot time if you choose 
the appropriate options in the kernel config.  I generally compile my kernels 
that way so they use the available features in the hardware without the need 
to bother with hdparm.

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