Hi, On Saturday 23 June 2007, Carlo Wood wrote: > PS I'd like to do extensive testing with Bonnie++ to tune everything > there is to tune. But bonnie likes to write/read files TWICE the amount > of RAM I have. It therefore takes a LOT of time to run one test. Do you > happen to know how I can limit the amount of RAM that the linux kernel > sees to, say 500 MB? That should be enough to run in Single User mode > but allow me to run the tests MUCH faster. (I have dual channel, four > DIMM's of 1 GB each -- 2 GB per Core 2 die. Hopefully the fact that > I have dual channel isn't going to be a problem when limiting the ram > that the kernel sees.) "mem=" kernel parameter limits amount of memory seen by kernel (more info in Documentation/kernel-parameters.txt) You can also limit amount of RAM detected by bonnie++ by using -r parameter but please remember that this will make bonnie++ benchmark combined kernel I/O buffering + filesystem + hard disk performance instead of just filesystem + hard disk performance (as it can happen that some / all data won't ever hit the disk). Bart - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
