On Mon, May 09, 2016 at 02:53:30PM +0000, Stephen Bates wrote: > Christoph, this is a DRAM based NVMe device, the code for polling in NVMe was merged in 4.5 right? We are using the inbox NVMe driver. Here is some performance data: > > QD=1, single thread, random 4KB reads > > Polling Off: 12us Avg / 40us 99.99% ; > Polling On: 9.5us Avg / 25us 99.99% > > Both the average and 99.99% reduction are of interest. How does CPU usage look for common workloads with polling force enabled? If it's really an overall win we should just add a quirk to the NVMe driver to always force polling for this device based on the PCI ID. -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
