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Old 04-15-2011, 04:03 PM   #1
Woodsman
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Registered: Oct 2005
Distribution: Slackware 14.1
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Is libata.force really working?


In another thread I shared how my system occasionally freezes. I found a solution in which I forced the drive connected to sata port 1 (ata1) to run at 1.5 Gbps and let the second drive connected to sata port 2 run at 3.0 Gbps.

I have multiple systems on this machine. When I boot into Slackware 12.2 with the 2.6.27.58 kernel, I see this in dmesg:

ata1: FORCE: PHY spd limit set to 1.5Gbps
ata1: SATA max UDMA/133 cmd 0x9f0 ctl 0xbf0 bmdma 0xe000 irq 23
ata1: SATA link up 1.5 Gbps (SStatus 123 SControl 300)

Looks okay. When I boot into Slackware 13.1 I see this in dmesg:

ata1: FORCE: PHY spd limit set to 1.5Gbps
ata1: SATA max UDMA/133 cmd 0x9f0 ctl 0xbf0 bmdma 0xe000 irq 23
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)

Further, when I boot into 13.1 the freezing problems return. Therefore I suspect the drive is running at 3.0 Gbps.

1. Why isn't libata.force working?

2. How can I know what speed the drive is running?

Thanks.
 
Old 04-17-2011, 11:20 AM   #2
amani
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Registered: Jul 2006
Location: Kolkata, India
Distribution: 64-bit GNU/Linux, Kubuntu64, Fedora QA, Slackware,
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the boot option is

libata-force=1.5Gbps

(for all drives)

jumpers will be another way
 
Old 04-22-2011, 09:00 AM   #3
Woodsman
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Distribution: Slackware 14.1
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Quote:
libata-force=1.5Gbps
I haven't seen anything on the web that using the dash version is correct. Regardless, I updated to the 2.6.33.11 kernel and neither the dot nor dash version succeeds.

Quote:
jumpers will be another way
I'm already using jumpers. I want to know why the kernel parameter fails to function with the 2.6.33.x kernel but works as expected with the 2.6.27.58 kernel.
 
Old 04-25-2011, 09:41 AM   #4
amani
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Registered: Jul 2006
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If it is a module, then provide options to it (but this was the situation 2 years ago).
 
  


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