Alan McKinnon wrote:
My notebook works like that too.
Hard disk works fine when everything is set to AHCI, but then the system won't
boot from CD. So I enabled the IDE driver and the IDE driver for CD-ROMs.
My take on this is that Dell had a vast stock of cheap-skate CD-ROM hardware
and used them up. The engineering logic would have been "it doesn't matter
that we use the slow interface for that device, it's still faster than we can
get the data off the media."
And I thought there was something weird with me on this one. o_O I did
switch it back to AHCI after I got done booting the CD thingy. I really
can't tell any difference in speed between the two and neither could
hdparm -tT either.
root@fireball / # hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 6408 MB in 2.00 seconds = 3205.06 MB/sec
Timing buffered disk reads: 328 MB in 3.00 seconds = 109.22 MB/sec
root@fireball / #
I get about the same either way. Could that mean that when the kernel
boots that it switched over to AHCI regardless of the BIOS setting?
This is a little info too:
root@fireball / # dmesg | grep -i ahci
[ 0.827837] ahci 0000:00:11.0: version 3.0
[ 0.827855] ahci 0000:00:11.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
[ 0.828285] ahci 0000:00:11.0: AHCI 0001.0100 32 slots 6 ports 3 Gbps
0x3f impl SATA mode
[ 0.828840] ahci 0000:00:11.0: flags: 64bit ncq sntf ilck pm led clo
pmp pio slum part ccc
[ 0.830342] scsi0 : ahci
[ 0.830734] scsi1 : ahci
[ 0.831103] scsi2 : ahci
[ 0.831474] scsi3 : ahci
[ 0.831843] scsi4 : ahci
[ 0.832204] scsi5 : ahci
root@fireball / #
Someone may can talk be into rebooting and switching AHCI off and
testing again. Big may there. ;-)
Dale
:-) :-)
P. S. Seriously off topic. I used hugin the other day to stitch
together about a dozen pics from a 10Mpxl camera. It was awesome to
watch all four cores crunch on that thing. It was fast too. Going from
a single 2.5Ghz CPU to a four core 3.2Ghz CPU is a huge difference.
