[Soekris] Harddisk Slow

[David Young]

On Wed, Jan 31, 2007 at 02:48:11PM +0100, Igor Sobrado wrote:
> In message <20070131105543.GB1800 at mathom.us>, Michael Stone writes:
> > On Wed, Jan 31, 2007 at 10:21:04AM +0100, Igor Sobrado wrote:
> > >bs is the block size, not the buffer size.  It is, however, an useless
> > >parameter if the filesystem is not tuned to use that block size on all
> > >transactions by means of newfs.  
> > 
> > It's not useless, as the numbers provided by the person you're replying 
> > to show. A meg is overkill, but but it obviously was better than 512b. 
> 
> Hi Mike.
> 
> A block size of 1MB means that the even small scripts (e.g., a 600 bytes
> shell script) will require 128KB to be stored.  Indeed, larger block
> sizes show that the IDE controller is not the bottleneck on these
> appliances.  I am just curious: if these drives are working in advanced
> DMA modes (in most cases, UltraDMA 2) why is the interrupt load so high?

Igor,

Sorry to ask such a basic question, but when you say "the interrupt load,"
do you mean that the %CPU spent processing interrupts is higher, or do you
mean that the number of interrupts per work done by the IDE controller
is higher?  I ask because it makes sense to me that the %CPU would be
higher than on your PowerEdge 350, however, it doesn't immediately make
sense to me that the number of interrupts would be higher.

Dave

-- 
David Young             OJC Technologies
dyoung at ojctech.com      Urbana, IL * (217) 278-3933