[PLUG] Confusion with DMA on or off

Derek Loree drl at drloree.com
Wed Oct 22 13:35:03 UTC 2003


On Wed, 2003-10-22 at 11:09, Sasha Romanosky wrote:
> okay, looks like I'm good, then. Thanks for the feedback. 
> 
> > Try turning off DMA using hdparm, then rerun the -Tt tests.  
> > They will be slower if DMA was functioning before.
> > 
> > > 
> > 100 MB/sec. is about right for UDMA(100), the 30 MB/sec is 
> > about right for a modern IDE drive.
> 
> Good to know. Thanks
> 
> > > /dev/hdf:
> > >  Timing buffer-cache reads:   128 MB in  1.16 seconds =110.34 MB/sec
> > >  Timing buffered disk reads:  64 MB in  1.47 seconds = 43.54 MB/sec
> > > 
> > WOW, better than 40 MB/sec.  What kind of drive is that one?
> > 
> 
> This one of those western digital 120G drives that fry's has on sale
> every now and again. It was purchased a month or two ago. 

Good to know.

Thanks,

Derek Loree






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