• Jose Abreu's avatar
    net: stmmac: Add Split Header support and enable it in XGMAC cores · 67afd6d1
    Jose Abreu authored
    Add the support for Split Header feature in the RX path and enable it in
    XGMAC cores.
    
    This does not impact neither beneficts bandwidth but it does reduces CPU
    usage because without the feature all the entire packet is memcpy'ed,
    while that with the feature only the header is.
    
    With Split Header disabled 'perf stat -d' gives:
    86870.624945 task-clock (msec)      #    0.429 CPUs utilized
         1073352 context-switches       #    0.012 M/sec
               1 cpu-migrations         #    0.000 K/sec
             213 page-faults            #    0.002 K/sec
    327113872376 cycles                 #    3.766 GHz (62.53%)
     56618161216 instructions           #    0.17  insn per cycle (75.06%)
     10742205071 branches               #  123.658 M/sec (75.36%)
       584309242 branch-misses          #    5.44% of all branches (75.19%)
     17594787965 L1-dcache-loads        #  202.540 M/sec (74.88%)
      4003773131 L1-dcache-load-misses  #   22.76% of all L1-dcache hits (74.89%)
      1313301468 LLC-loads              #   15.118 M/sec (49.75%)
       355906510 LLC-load-misses        #   27.10% of all LL-cache hits (49.92%)
    
    With Split Header enabled 'perf stat -d' gives:
    49324.456539 task-clock (msec)     #    0.245 CPUs utilized
         2542387 context-switches      #    0.052 M/sec
               1 cpu-migrations        #    0.000 K/sec
             213 page-faults           #    0.004 K/sec
    177092791469 cycles                #    3.590 GHz (62.30%)
     68555756017 instructions          #    0.39  insn per cycle (75.16%)
     12697019382 branches              #  257.418 M/sec (74.81%)
       442081897 branch-misses         #    3.48% of all branches (74.79%)
     20337958358 L1-dcache-loads       #  412.330 M/sec (75.46%)
      3820210140 L1-dcache-load-misses #   18.78% of all L1-dcache hits (75.35%)
      1257719198 LLC-loads             #   25.499 M/sec (49.73%)
       685543923 LLC-load-misses       #   54.51% of all LL-cache hits (49.86%)
    
    Changes from v2:
    	- Reword commit message (Jakub)
    Changes from v1:
    	- Add performance info (David)
    	- Add misssing dma_sync_single_for_device()
    Signed-off-by: default avatarJose Abreu <joabreu@synopsys.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    67afd6d1
dwxgmac2_descs.c 7.65 KB