Hey Gary,
On Fri, May 18, 2018 at 04:51:56PM -0500, Gary R Hook wrote:
> Improve the performance of the PPR log polling function (i.e. the
> task of emptying the log) by minimizing MMIO operations and more
> efficiently processing groups of log entries. Cache the head
> pointer, as there's never a reason to read it. Ensure the head
> pointer register is updated every so often, to inform the IOMMU
> that space is available in the log.
>
> Finally, since a single pass may leave logged events unread, use
> an outer loop to repeat until head has caught up to tail.
>
> Signed-off-by: Gary R Hook <[email protected]>
Do you have numbers for the performance improvement? How did you test
this patch?
Regards,
Joerg
_______________________________________________
iommu mailing list
[email protected]
https://lists.linuxfoundation.org/mailman/listinfo/iommu
