>> This motherboard (EPoX MF570SLI) uses PCI-E. > > PCI-E is quite different architecturally from PCI-X. > >> It has a plain old PCI video card in it: >> Trident Microsystems TGUI 9660/938x/968x >> and yet I appear to be able to sustain plenty of disk bandwidth to 4 drives: >> (dd if=/dev/sd[b,c,d,e] of=/dev/null bs=64k) >> vmstat 1 reports: >> 290000 to 310000 "blocks in", hovering around 300000. >> >> 4x70 would be more like 280, 4x75 is 300. Clearly the system is not >> bandwidth challenged. >> (This is with 4500 context switches/second, BTW.) > > Possibly you are using an on-board disk controller, and then it most > likely does not use the PCI-E bus for disk IO. I only point it out to show how this setup scales. If there were bottlenecks in the chipset, they'd have shown up in the test. -- Jon -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
