Sorry, I found out that the great gap of performance between PC and TARGET
seems no relations to cache flushes feature.
The hd on target does not support cache flushes, I attached a supported hd
on target just now, but the performance is very bad as well.
[EMAIL PROTECTED] tmp]# dmesg | grep flush
hda: cache flushes supported
[EMAIL PROTECTED] tmp]# ./hdparm -T /dev/hda
/dev/hda:
Timing cached reads: 68 MB in 2.04 seconds = 33.25 MB/sec
While it can reach to 1.7GB/sec on PC, how can I get such a good performance
on TARGET? please
thanks
On 5/22/07, Tito <[EMAIL PROTECTED]> wrote:
On Tuesday 22 May 2007 10:34:43 kaimi wrote:
> Another question, on my pc, the hd supports cache flushes, it shows:
>
> [EMAIL PROTECTED] linux-2.6.20-dm]# hdparm -T /dev/hdb
>
> /dev/hdb:
> Timing cached reads: 3344 MB in 2.00 seconds = 1671.72 MB/sec
>
> and my target board does not support cache flushed, it shows:
> [EMAIL PROTECTED] tmp]# ./hdparm -T /dev/hda
>
> /dev/hda:
> Timing cached reads: 68 MB in 2.04 seconds = 33.30 MB/sec
>
> I don't know if this feature is the inducement, I want to disable this
> feature on pc, what's the command? thanks
Maybe man hdparm:
-W Disable/enable the IDE drive´s write-caching feature
(default
state is undeterminable; manufacturer/model specific).
ciao,
Tito
>
> On 5/22/07, kaimi <[EMAIL PROTECTED]> wrote:
> >
> > hi,all
> > I want to enable cache flushes for my hd on s3c2410 & linux-2.6.20
,
> > ide_id_has_flush_cache() return 0 because cfs_enable_2 is 0x201, while
it
> > needs 0x3000, I found out that 0x201 was from 512 bytes of id
> > info,implemented in static void ata_input_data(ide_drive_t *drive,
void
> > *buffer, u32 wcount)
> > the question is, does it mean my hd does not support cache flush on hw
> > layer? if not, how to enable?
> > thanks for the coming help!
> >
> > Rgrds
> > Kaimi
> >
> >
>
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