Rajesh Fowkar wrote:
> Hi,
>
> On my 17GB HDD, if I enable 32bit IO using
>
> hdparm -c1 /dev/hda
>
> the read / write speed shows decrease in speed and not increase. Why is this
>happening ?
> Any ideas.
>
>
The buffering might decreae ,but the actual data read increases. don't look at the
first
number , it is the speed at which data moves from the on disk ram cache to main
memory. the
second number is the speed at which data moves from the disk to the cache.
by the way have you set dma to 1 -d 1 ? your values are pretty low .
Cheerio
Robin
> Here are the results :
>
> rajesh:~ # hdparm -c1 /dev/hda
>
> /dev/hda:
> setting 32-bit I/O support flag to 1
> I/O support = 1 (32-bit)
> rajesh:~ # hdparm -Tt /dev/hda
>
> /dev/hda:
> Timing buffer-cache reads: 64 MB in 2.37 seconds =27.00 MB/sec
> Timing buffered disk reads: 32 MB in 6.64 seconds = 4.82 MB/sec
>
> rajesh:~ # hdparm -c0 /dev/hda
>
> /dev/hda:
> setting 32-bit I/O support flag to 0
> I/O support = 0 (default 16-bit)
> rajesh:~ # hdparm -Tt /dev/hda
>
> /dev/hda:
> Timing buffer-cache reads: 64 MB in 1.69 seconds =37.87 MB/sec
> Timing buffered disk reads: 32 MB in 8.32 seconds = 3.85 MB/sec
>
> Thanks in advance.
>
> Rajesh
>
> Shanker Balan saw fit to inform me that:
> >Put the hdparm line in the file /etc/rc.d/rc.local
> >
> >--Shanu
> >
>
> --
> Rajesh(ALIAS Shriram) Fowkar
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