On Mon, Jul 15, 2019 at 01:59:33PM +0300, Artem Bityutskiy wrote: > From: Artem Bityutskiy <artem.bityuts...@linux.intel.com> > > Decode 'RR2DCDELAY' register which Linux kernel provides starting from version > 5.3. The corresponding commit in the Linux kernel is: > cd502a7f7c9c igb: add RR2DCDELAY to ethtool registers dump > > The RR2DCDELAY register is present in I210 and I211 Intel Gigabit Ethernet > chips and it stands for "Read Request To Data Completion Delay". Here is how > this register is described in the I210 datasheet: > > "This field captures the maximum PCIe split time in 16 ns units, which is the > maximum delay between the read request to the first data completion. This is > giving an estimation of the PCIe round trip time." > > In practice, this register can be used to measure the time it takes the NIC to > read data from the host memory. > > Signed-off-by: Artem Bityutskiy <artem.bityuts...@linux.intel.com>
Queued for next release -- thanks! John -- John W. Linville Someday the world will need a hero, and you linvi...@tuxdriver.com might be all we have. Be ready.
