On 06/22/2011 09:56 AM, Paul Menzel wrote:
Dear SATA subsystem folks, please keep my address in CC list since I am not subscribed. This is a reply to my message to the coreboot list [1] and I am adding more current information to it. Am Sonntag, den 19.06.2011, 20:30 +0200 schrieb Paul Menzel: the ASUS M2V-MX SE HAS A VIA K8T890 chipset and the following BIOS version is used.$ sudo dmidecode […] # dmidecode 2.9 SMBIOS 2.4 present. 49 structures occupying 1801 bytes. Table at 0x000F0740. Handle 0x0000, DMI type 0, 24 bytes BIOS Information Vendor: American Megatrends Inc. Version: 0304 Release Date: 10/30/2007 Address: 0xF0000 Runtime Size: 64 kB ROM Size: 512 kB […] I had to replace my hard drive and bought a new SATA-II disk. Unfortunately the full speed is not detected. Instead of UDMA/133 – as was used with the old SATA-I disk – it is reporting UDMA/100. $ uname -a Linux joe 2.6.32-5-amd64 #1 SMP Tue Mar 8 22:49:26 UTC 2011 x86_64 GNU/Linux $ dmesg # new SATA-II disk […] [ 0.792878] ata3: SATA max UDMA/133 cmd 0xec00 ctl 0xe880 bmdma 0xe400 irq 21 [ 0.792881] ata4: SATA max UDMA/133 cmd 0xe800 ctl 0xe480 bmdma 0xe408 irq 21 […] [ 1.384015] ata4: SATA link up 1.5 Gbps (SStatus 123 SControl 300) [ 1.392019] usb 2-1: new low speed USB device using uhci_hcd and address 2 [ 1.548219] ata4.00: ATA-8: WDC WD20EARS-60MVWB0, 51.0AB51, max UDMA/100 Here seems to be the problematic line, that somehow the drive is reporting the wrong maximum speed or the chipset does not detect it correctly.
UDMA setting is a legacy of PATA, and tends to have very little relevance to SATA.
I wouldn't worry about it unless you are actually measuring low performance, as opposed to just looking at dmesg.
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