On Tue, Nov 1, 2016 at 12:04 PM, Michał Purzyński <michalpurzyns...@gmail.com> wrote: > Looking through some old posts on e1000 I found that one can detect if DCA > is enabled with ethregs. Are these registers per queue? Here, the X520 is > configured with a single queue and the highest bits are set only for > DCA_RXCTRL[000].
Yes, the registers are per queue. If I recall each queue can support a different DCA tag. > On X520 > > DCA_RXCTRL[000] 1f0002a0 > DCA_RXCTRL[001] 00001200 > > etc > > DCA_TXCTRL[000] 1f002220 > DCA_TXCTRL[001] 00002200 > > etc - 0's all the way down > > (second port, same card) > > DCA_RXCTRL[000] 1f0002a0 > DCA_RXCTRL[001] 00001200 > > Also zeros all the way on highest bits. > > There are no registers with DCA in name for X710 - what should I look for > instead? I don't believe the X710 supports DCA. It relies on DDIO which has been available for the last several CPU generations. > BTW, how is DCA different from DDIO? DCA is a precursor to DDIO. Basically the idea is to have the device include a special tag in DMA write transactions that indicates which socket the data is supposed to be written to. With DDIO it occurs automatically when the device is writing to the local socket. - Alex ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
