On Tue, 15 Oct 2002 15:42, Hans Reiser wrote: > Russell Coker wrote: > >See the following graph: > >http://www.coker.com.au/~russell/hardware/46g.png > > > >This shows testing a single 46G drive, two drives on different buses at > > the same time, and two drives on the same bus at the same time. zcav > > (part of Bonnie++) was used to perform the tests. > > I am surprised that separating them onto different buses has so little > effect. It looks like most of the bottleneck for large reads off two > drives is not the IDE bus, but something else (maybe CPU or memory > bandwidth).
I was surprised too. Especially as it's an ATA-66 bus (the bus was expected to be a bottleneck). Only a single CPU. I would like to do more research on this matter and write a magazine article (I already have a magazine wanting to publish it). All I need is suitable access to the latest hardware to perform my tests (tests on old hardware while still being interesting research doesn't sell magazines). -- http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark http://www.coker.com.au/postal/ Postal SMTP/POP benchmark http://www.coker.com.au/projects.html Projects I am working on http://www.coker.com.au/~russell/ My home page
