Moritz Heiber wrote:
On Sun, 07 May 2006 11:59:36 +0900
What does the BIOS say exactly? SATA II is a vague term. It
comprises several features. Some call NCQ-capable drives SATA-II
while others consider 3.0Gbps link SATA-II.
The manufacturer's url [1] states the following:
"PCI E SATA2 controller on board, optimizing the support for SATA2 HDD"
The BIOS and the manual [2] also state a speed advantage of 3.0Gbps.
[1] http://www.asrock.com/product/939Dual-SATA2.htm
[2] http://www.asrock.com/Drivers/Manual/939Dual-SATA2.pdf
(Page 6)
Hmmm...
[..snip..]
* both the controller and drive support 3Gbps but somehow they fail
to negotiate at that speed.
I guess that is the most likely explainations. Any way of solving that
issue?
If this is the cause, it's a hardware problem. Driver doesn't play any
role in PHY spd negotiation other than limiting the top speed.
* BIOS limits link spd to 1.5Gbps using SControl in the hope for
improving compatibility
Giving that a thought .. the board's only PCIe slot is already occupied
by a pretty advanced video card. Could it be that the _bus_ is simply
outrun in terms of available bandwidth?
No, completely unrelated.
More info can be obtained by printing SCR_CONTROL, just print the
result of scr_read(ap, SCR_CONTROL) from
libata.c::sata_print_link_status(), which prints the SStatus value.
I'm going to try to follow that lead. There doesn't seem to be any sort
of tool or application that runs the exact same test yet, is there?
hdparm fails on me.
Heh heh... I should have attached a patch for this. I was too lazy.
I'm attaching one on this mail.
Whatever the reason is, don't torture yourself over it. It simply
isn't worth. 1.5Gbps is more than enough for any drive on market
today.
Well, I'm just making an effort to get the best out of the hardware I
bought. I might fail at some point .. but at least I can say I tried.
Yeap, good luck. FYI, my seagate 7200.9 and samsung hd160jj work fine @
3Gbps on ICH7 AHCI, sil3124 and sil3132.
--
tejun
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 8beba3c..966be30 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1503,20 +1503,23 @@ void ata_port_probe(struct ata_port *ap)
*/
static void sata_print_link_status(struct ata_port *ap)
{
- u32 sstatus, tmp;
+ u32 sstatus, scontrol, tmp;
if (!ap->ops->scr_read)
return;
sstatus = scr_read(ap, SCR_STATUS);
+ scontrol = scr_read(ap, SCR_CONTROL);
if (sata_dev_present(ap)) {
tmp = (sstatus >> 4) & 0xf;
- printk(KERN_INFO "ata%u: SATA link up %s (SStatus %X)\n",
- ap->id, sata_spd_string(tmp), sstatus);
+ printk(KERN_INFO
+ "ata%u: SATA link up %s (SStatus %X SControl %X)\n",
+ ap->id, sata_spd_string(tmp), sstatus, scontrol);
} else {
- printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
- ap->id, sstatus);
+ printk(KERN_INFO
+ "ata%u: SATA link down (SStatus %X SControl %X)\n",
+ ap->id, sstatus, scontrol);
}
}
