I/OAT configuration ?

From: Ravinandan Arakali
Date: Thu Aug 17 2006 - 20:05:59 EST

I am trying to use I/OAT on one of the newer woodcrest boxes.
But not sure if things are configured properly since there
seems to be no change in performance with I/OAT enabled
or disabled.
Following are the steps followed.
1. MSI (CONFIG_PCI_MSI) is enabled in kernel(
2. In kernel DMA configuration, following are enabled.
Support for DMA Engines
Network: TCP receive copy offload
Test DMA Client
Intel I/OAT DMA support
3. I manually load the ioatdma driver (modprobe ioatdma)

As per some documentation I read, when step #3 is performed
successfully, directories dma0chanX is supposed to be created
under /sys/class/dma but in my case, this directory stays
empty. I don't see any messages in /var/log/messages.
Any idea what is missing ?


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/