On Sun, Mar 26, 2006 at 11:05:33PM +0200, Raz Ben-Jehuda(caro) wrote: > Hello guys. > I have been testing performance of 4 maxtor disks combined as > raid0 . the test was of reading random 1M ios all over the raid > in asynchrnous IO mode. > ahci bits satapii by 50% . while satapii gives 80MB/s ahci gives > over 120 MB/s . > > Why is that ? what is the difference between the two ? > If your BIOS programmed your controller in such way that two SATA ports share a controller (ie. SATA P0 is primary master while SATA P1 is primary secondary), two ports should serialize, so the lower throughput. Try to choose other legacy mode. My BIOS puts each port into different controller if I put it into Enhanced mode, but YMMV. And, next time, don't forget dmesg. -- tejun - : 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
