Messages in this thread | | | Date | Fri, 10 Feb 2006 12:36:57 -0500 | From | Wakko Warner <> | Subject | Re: disabling libata |
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Imre Gergely wrote: > > > Erik Mouw wrote: > > Yes, I know that's possible for some SATA adapters, but my question is > > why would you want to do that? The SATA support in the IDE subsystem is > > deprecated, you should really use libata. > > > > > > Erik > > > > maybe it's just me... but it looks like if as SCSI device the whole thing is > slower than with IDE. i haven't tested it yet, but as sda the system load is > very high, i did some tests with dd, and the CPU usage is always at 98-100%. > and when i'm copying something to another disk, the other programs barely move, > sometimes even the mouse gets stuck. i dunno where this is coming from. i > thought i try with the old driver.
I asked this same question with U320 scsi controller. I noticed my CPU went to 100%. It never really was being used at all, just in wait. Run top to see if "wa" is high or not.
This is what I see (no load, no disk activity) for the CPU: Cpu(s): 0.1% us, 0.1% sy, 0.0% ni, 97.6% id, 2.2% wa, 0.0% hi, 0.1% si
Copying a single disk to /dev/null (9.1gb): Cpu(s): 0.0% us, 1.7% sy, 0.0% ni, 74.8% id, 23.3% wa, 0.0% hi, 0.2% si
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