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Re: SATA->IDE emulation on IBM P4 bogs down on HD writes

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Henrik Carlqvist <Henrik.Carlqvist@deadspam.com> writes:

> On Sat, 28 May 2016 04:07:58 -0300, Mike Spencer wrote:
>
>> The bogging down only occurs during writes to the main SATA HD
>> connected to the "SATA IDE" plug on the mobo.
> 
> My guess is that your bad performance is explained by lack of DMA. You 
> could verify that guess by studying the output of
> 
> hdparm -i /dev/hda

Okay. HD details are getting kinda above my pay grade but I'll see
what I can puzzle out. 

> You will probably get better performance with DMA if you instead use your 
> SATA drive in SATA mode. That could probably be accomplished by changing 
> some setting in your CMOS setup. My guess is that you now have a setting 
> which might be named something like "legacy" or "IDE" when you instead 
> shoule have a setting named something like "SATA" or "AHCI".

I'll look for that, too.  I don't recall ever seeing anything like
that but I may have forgotten or ignored it.

> Once that setting is changed your kernel might instead see your drive as 
> /dev/sda instead of /dev/hda. As such you might have to reconfigure your 
> /etc/fstab and/or your bootloader.

Yes.  Lilo's been told MBR->hda3 and fstab is about hda partitions.

We have a week or maybe a fortnight just now to get all our vegetable
gardens in so it's taking priority.  Bit of extra bother keeping the
rabbits & porcupines away from the veggies with assorted ad hoc fencing.


Tnx,
-- 
Mike Spencer                  Nova Scotia, Canada

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SATA->IDE emulation on IBM P4 bogs down on HD writes Mike Spencer <mds@bogus.nodomain.nowhere> - 2016-05-19 20:23 -0300
  Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2016-05-19 16:32 -0700
    Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Mike Spencer <mds@bogus.nodomain.nowhere> - 2016-05-20 12:28 -0300
      Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2016-05-20 09:10 -0700
  Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2016-05-22 11:37 +0200
  Re: SATA->IDE emulation on IBM P4 bogs down on HD writes "Carlos E.R." <robin_listas@invalid.es> - 2016-05-24 21:52 +0200
    Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Mike Spencer <mds@bogus.nodomain.nowhere> - 2016-05-28 04:07 -0300
      Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Henrik Carlqvist <Henrik.Carlqvist@deadspam.com> - 2016-05-28 11:09 +0000
        Re: SATA->IDE emulation on IBM P4 bogs down on HD writes "Carlos E.R." <robin_listas@invalid.es> - 2016-05-28 17:12 +0200
        Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Mike Spencer <mds@bogus.nodomain.nowhere> - 2016-05-29 01:50 -0300
          Re: SATA->IDE emulation on IBM P4 bogs down on HD writes ANTant@zimage.com (Ant) - 2016-05-29 11:41 -0500
        Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Mike Spencer <mds@bogus.nodomain.nowhere> - 2016-05-29 02:41 -0300
          Re: SATA->IDE emulation on IBM P4 bogs down on HD writes "Carlos E.R." <robin_listas@invalid.es> - 2016-05-29 14:06 +0200
            Re: SATA->IDE emulation on IBM P4 bogs down on HD writes ANTant@zimage.com (Ant) - 2016-05-29 11:42 -0500
              Re: SATA->IDE emulation on IBM P4 bogs down on HD writes "Carlos E.R." <robin_listas@invalid.es> - 2016-05-29 21:09 +0200
                Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Aragorn <thorongil@telenet.be.invalid> - 2016-05-30 10:57 +0200
                Re: SATA->IDE emulation on IBM P4 bogs down on HD writes "Carlos E.R." <robin_listas@invalid.es> - 2016-05-30 14:21 +0200
                Re: SATA->IDE emulation on IBM P4 bogs down on HD writes Aragorn <thorongil@telenet.be.invalid> - 2016-05-30 15:49 +0200

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