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
Following are the steps followed.
1. MSI (CONFIG_PCI_MSI) is enabled in kernel(18.104.22.168).
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 ?
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