[Soekris] Harddisk Slow
dyoung at pobox.com
Wed Jan 31 17:59:15 UTC 2007
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?
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.
David Young OJC Technologies
dyoung at ojctech.com Urbana, IL * (217) 278-3933
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