Re: File system performance, hardware performance, ext3, 3ware RAID1, etc.

[Daniel Blueman]

It is a small loss that the TCQ-support implementation hasn't been stable on
linux so far. I guess mostly due to the great I/O scheduling Linux has (ie
anticipatory scheduler).

Yes, a growing number of IDE disk manufacturers are using native S-ATA
controllers in their disks, and TCQ is one of the core features (ie unique selling
point), as well as being implemented on the more lavish P-ATA controllers.

It's just a shame that there are still issues saturating a bunch of IDE
disks with software RAID in the 2.6 series, but I guess that'll be ironed out in
time...

> Daniel Blueman wrote:
> > many modern IDE disks and
> > controllers also have tagged command queuing, so it is even more of a
> corner case.
> 
> Linux doesn't use tagged command queueing, though - the code has been
> disabled for some time.  I thought the TCQ stuff was disabled because
> only very few disks supported it and the code wasn't reliable.
> 
> Yet you say many modern disks support it?
> 
> -- Jamie
> 

-- 
Daniel J Blueman

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