On 07/06/2007 02:30 PM, Christoph Pleger wrote:
And what about hdparm (setting 32bit I/O and multi-sector mode)? Suren
wrote that 32bit I/O makes no sense when using DMA. Maybe that's right,
but it does not correspond with my experiences. At least, I have the
"feeling" that my IDE disks work much faster since I enabled 32bit
support (DMA already was on before).
hdparm -t /dev/hda (or /dev/sda -- it works for the SD interface as well) is
a quick test of a drive's sequential read speed.
I have, at the time, noticed at least on older controllers/drives (Intel 430
generation chipsets with things like 8G UDMA33 disks) that I could reliably
increase the result with something like 1MB/s (to a total of 6 to 8, so it
wasn't insignificant) by enabling 32-bit I/O. Had also understood that it
shouldn't make a difference with DMA, but just went "oh well" and stuck a
"hdparm -c1" in my bootup scripts.
(if anyone tries; note that hdparm -a can have a large effect on that result
as well on some setups -- on machines where it does, -a 1024 usually gives
me best results)
Rene.
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