Jonathan Gray wrote:
On Tue, Jan 30, 2007 at 08:50:53AM +0100, Heinrich Rebehn wrote:
attaching the drive to a notebook via a IDE/USB converter easily yields
20 MB/s. So the drive *is* faster. While i could live with 8 MB/s i
cannot accept the high CPU usage. It seems to make the installed crypto
accelerator almost ineffective because the interrupts cannot be served
fast enough.
I suspect that the disk is not running in DMA mode. Is there any tool to
verify that (like Linux's hdparm)?
Cheers,
Heinrich
A dmesg and the output of "atactl wd0"
dmesg talks about DMA:
-------
[EMAIL PROTECTED] [~] # dmesg|grep wd1
wd1 at pciide0 channel 0 drive 1: <FUJITSU MHV2120AT>
wd1: 16-sector PIO, LBA, 114473MB, 234441648 sectors
wd1(pciide0:0:1): using PIO mode 4, Ultra-DMA mode 2
dkcsum: wd1 matches BIOS drive 0x81
No word about DMA in atactl:
[EMAIL PROTECTED] [~] # atactl wd1
Model: FUJITSU MHV2120AT, Rev: 000000A0, Serial #: NS17T6B27U4D
Device type: ATA, fixed
Cylinders: 16383, heads: 16, sec/track: 63, total sectors: 234441648
Device capabilities:
ATA standby timer values
IORDY operation
Device supports the following standards:
ATA-2 ATA-3 ATA-4 ATA-5 ATA-6 ATA-7
Master password revision code 0xfffe
Device supports the following command sets:
READ BUFFER command
WRITE BUFFER command
Host Protected Area feature set
Read look-ahead
Write cache
Power Management feature set
Security Mode feature set
SMART feature set
Flush Cache command
Device Configuration Overlay feature set
Automatic Acoustic Management feature set
Set Max security extension commands
Power-up in standby feature set
Advanced Power Management feature set
DOWNLOAD MICROCODE command
IDLE IMMEDIATE with UNLOAD FEATURE
SMART self-test
SMART error logging
Device has enabled the following command sets/features:
READ BUFFER command
WRITE BUFFER command
Host Protected Area feature set
Read look-ahead
Write cache
Power Management feature set
SMART feature set
Flush Cache command
Device Configuration Overlay feature set
Automatic Acoustic Management feature set
Advanced Power Management feature set
DOWNLOAD MICROCODE command
BTW, as others suggested, i can increase the throughput by using a
larger blocksize, but the CPU usage remains that high.
--Heinrich
