On Sun, 19 Dec 2004, Tim Moore wrote: > AndyLiebman@xxxxxxx wrote: > > So, as I said above, that means I don't have any drives connected to the > > two PCI-X 133 slots (or to the segments they correspond to) because that > > would slow down the bus speed for those segments and presumably hurt my > > network performance. > > Since the PCI/133 bandwidth available is about 1GB/s and a GbE port consumes > 100MB/s, that leaves 900MB/s for disk controllers that will only do 400MB/s. > On the 100MHz slot you get 800MB/s. This is the first thing to change, then > retest. > Network controllers are very interrupt intensive and can pull down the troughput of the disk controllers due to the high interrupt rate. I remember when I added, on a PCI-X bus that only had the disk controller, a GbE card the performance of the disks dropped by 10-20%. Bandwith was more then enough there. Holger - 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
