Did I ruin DDIO with DCA=2 parameter to X520? Looking at the driver code, I just enabled DCA instead.
> On 1 Nov 2016, at 20:56, Alexander Duyck <alexander.du...@gmail.com> wrote: > > 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
