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

[Russell Coker]

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.

-- 
http://www.coker.com.au/bonnie++/     Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/       Postal SMTP/POP benchmark
http://www.coker.com.au/projects.html Projects I am working on
http://www.coker.com.au/~russell/     My home page