On 20 Apr, 14:20, Bhuvan Kumar MITTAL <[EMAIL PROTECTED]> wrote:
Hi, I am working on an audio device driver development on Linux. I have a kernel buffer which I have mapped to user space using mmap call from user space. My problem is that the data which comes to the kernel buffer is getting dropped in user space and I get only 50-60% of the data which is randomly ordered. The user to kernel level buffer address translation code is fine and I suspect this data dropping is occurring coz the kernel buffer is cacheable. Please suggest me some way of making the entire buffer non cacheable. I am stuck on this for quite a while now.
You can use rdmsr() in your driver to check if the page attribute table MSR is available, then find and/or add the right entry in the table to set in each page's flags. This is documented in the Intel IA-32 Intel Architecture Software Developer's Manuals at intel.com. Dan -- Daniel J Blueman - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
