DMA u sata (was: nereagujici aplikace pri spouste volneho cpu)

[Aleš Kozumplík]

On Tuesday 08 February 2005 11:11 am, Roman DAVID wrote:
> Aleš Kozumplík wrote:
> > libata version 1.10 loaded.
> > sata_sil version 0.8
>
> ...................
>
> > ata1: dev 0 ATA, max UDMA/100, 234441648 sectors: lba48
> > ata1: dev 0 configured for UDMA/100
>
> Ja bych rekl, ze DMA funguje, problem bude zrejme nekde jinde.
> Jakou hodnotu vypise /sbin/hdparm -t /dev/sda ?
>
> Melo by se to pohybovat okolo 40 MB/s (nebo vice).
>
> Roman DAVID

toto presne mi to vraci:

# hdparm -tT /dev/sda

/dev/sda:

/dev/sda:
 Timing cached reads:   1728 MB in  2.00 seconds = 863.27 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for 
device
 Timing buffered disk reads:  142 MB in  3.01 seconds =  47.23 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for 
device


takze rychlost funkcni. ale je to DMA kdyz kopirovani vytizi CPU: wa: 90% (dle 
top)??

Al_