On Wednesday 02 June 2004 18:48, Jon LaBadie wrote: >On Wed, Jun 02, 2004 at 04:21:35PM -0600, Glenn English wrote: >> On Wed, 2004-06-02 at 14:12, Gene Heskett wrote: >> > Any current ide drive can do 30+ Mb/sec if left >> > alone by other tasks, often quite a ways on the + side. >> >> Is that just a burst out of the cache, or can they read >> dis-contiguous files, seek around to other files, wait for >> latency, and write all at the same time that fast? Or even half >> that fast? If so, and if Linux and Intel's IDE controllers lose >> another 25% moving bits around, it'd still be comfortably faster >> than the tape drive. I think I may have something horribly >> misconfigured. > >On Solaris x86, one thing that terribly degrades IDE disk >performance is if the driver does not use dma but uses pio mode. >There are even reports of diagnostic tools saying the drive is >using dma, but digging deeper determines that pio mode is in use. > >I know not how to check or configure the HD driver on linux, >but it might be something to check.
It's true of any os, not just solaris, and I thought of that, but got lost and didn't mention it in my novel on this. Thanks for reminding me. I think I may have assumed he had all that checked out. My mistake. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) 99.23% setiathome rank, not too shabby for a WV hillbilly Yahoo.com attorneys please note, additions to this message by Gene Heskett are: Copyright 2004 by Maurice Eugene Heskett, all rights reserved.