Re: suboptimal disk speed on N2100

[John Winters <john@sinodun.org.uk>]

martin f krafft wrote:
> Hey folks,
> 
> I just dived into the ARM world with a new N2100, which I installed
> with lenny and Martin Michlmayr's DMA-enhanced kernels, version
> 2.6.26-17lenny1dma1. Now I am synchronising all my data onto the
> device, and I am somewhat shocked by the horrific performance.
> 
> hdparm states:
> 
>   Timing cached reads:   324 MB in  2.00 seconds = 161.81 MB/sec
>   Timing buffered disk reads:   42 MB in  3.02 seconds =  13.90 MB/sec

For reference, my N2100 (which I would expect to be slower because it's
still running etch and arm rather than armel) scores:

 Timing cached reads:    60 MB in  2.01 seconds =  29.90 MB/sec
 Timing buffered disk reads:   42 MB in  3.10 seconds =  13.56 MB/sec

I'm surprised the second one is the same as yours.  Kernel is:

Linux thecus 2.6.24-etchnhalf.1-iop32x #1 Mon Jul 27 08:26:00 BST 2009
armv5tel GNU/Linux

John