Hello, I have the following question regarding the (re-)allocation of dma-able memory for a PCIe device. I wish to know on which CPU / Memory controller the dma-able memory will be allocated. In addition i would like to know how i can control this allocation process, or how to reroute it to another CPU / Memory controller. The system i use contains two Nehalem processors connected via intel QPI bus. Both processors have 3GB of DDR3 RAM in their memory banks. The PCIe bus is controlled by a tylersburg io hub which is also connected to the intel QPI bus The system runs a 64bit linux kernel. Furthermore a PCIe device which can only use 32 bit addressing is connected to the PCIe bus. I want to allocate dma-able memory for this device using a driver, i know how to do this. For maximal performance i would like to control the allocation of dma-able memory, in particular the allocation to a certain CPU / memory controller. The tylersburg IO hub has an influence on this allocation but can i influence this. So my questions are: -1- How can i know were our dma-able memory is allocated in physical memory? -2- How can i control / redirect this allocation to a certain memory controller / CPU? Thanks for any reply, Rob van de Voort P.S I'd be grateful if people could point me in the direction of resources I could read. Thus far I have gone over the PCI / DMA documentation in the kernel, and a couple of articles on lwn. If this is the wrong mailing list for this type of question i hope you can redirect me to the correct one. Disclaimer: The information contained in this email, including any attachments is confidential and is for the sole use of the intended recipient(s). Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please notify the sender immediately by replying to this message and destroy all copies of this message and any attachments. -- To unsubscribe from this list: send the line "unsubscribe linux-numa" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
