Messages in this thread | | | Date | Thu, 03 Feb 2005 19:03:48 +0000 | From | Paulo Marques <> | Subject | Re: Drive performance bottleneck |
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Ian Godin wrote: > [...] > Definitely have been able to repeat that here, so the SG driver > definitely appears to be broken. At least I'm glad I am not going > insane, I was starting to wonder :) > > I'll run some more tests with O_DIRECT and such things, see if I can > figure out what the REAL max speed is.
FYI there was a patch running around last April that made a new option for "dd" to make it use O_DIRECT. You can get it here:
http://marc.theaimsgroup.com/?l=linux-kernel&m=108135935629589&w=2
Unfortunately this hasn't made it into coreutils. IIRC there were issues about dd being multi-platform and the way O_DIRECT was done in other systems.
Anyway, you can patch dd yourself and have a tool for debugging with O_DIRECT. I hope this helps,
-- Paulo Marques - www.grupopie.com
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