Re: IDE/ATAPI

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Wed Apr 19 2000 - 10:20:46 EST


> > and if you want to give it a try. As to my experience, SCSI stuff is
> > usually smoother, particularly in respect to CPU load.
>
> please don't repeat this trite old falshood. modern ATA controllers
> are just as busmastering as decent SCSI cards.

Current ATAPI controllers and disks cannot do tagged queueing nor can they
do scatter gather DMA. That materially impacts performance under some
heavy server load patterns. For most uses it doesnt matter, and IDE is
a lot cheaper.

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