On Sep 15, 2009, at 5:52 PM, David Rees wrote:
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 toget an answer to.I can also confirm this sub par performance on the Sil 3124 - max throughputof around 120MB/s.If your motherboard is able to set the "PCIe Max Payload Size" you may beable to improve things. See Note 3 here: http://ata.wiki.kernel.org/index.php/Hardware,_driver_status#Silicon_Image_3124Another 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.
My port multiplier is a Sil3726, so very similar. However, my drives are all more or less identical and are all NCQ capable. I've been able to beat on them for days at a time under non-stop load and not had a problem.
-- Doug Ledford <dledford@xxxxxxxxxx> GPG KeyID: CFBFF194 http://people.redhat.com/dledford InfiniBand Specific RPMS http://people.redhat.com/dledford/Infiniband
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