On Tue, Sep 15, 2009 at 1:49 PM, Richard Scobie <richard@xxxxxxxxxxx> wrote: > Doug Ledford wrote: >> I agree with this sentiment 100%. I don't have a good answer for why it >> topped out where it did, and that's one of the things I'm still trying to >> get an answer to. > > I can also confirm this sub par performance on the Sil 3124 - max throughput > of around 120MB/s. > > If your motherboard is able to set the "PCIe Max Payload Size" you may be > able to improve things. > > See Note 3 here: > > http://ata.wiki.kernel.org/index.php/Hardware,_driver_status#Silicon_Image_3124 Another one here with a Sil3124 and max 120MB/s. With the port multiplier I've got, I've had to disable NCQ to get things to behave when accessing multiple drives - otherwise access to the enclosure would lock up under moderate/heavy concurrent disk access. The multipler appears to be a Sil4726. The array was built on a budget so the drives in the multiplier are a mix of drives - some are 1.5Mbps, some are 3.0Mbps and not all support NCQ. Not sure how it behaves with 100% NCQ capable drives. -Dave -- 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
