GPU performance tunning

DDR 输出带宽：
640M*8byte=5.1GB/s(其中8byte受限为DMC/BUS宽度的影响)

latency read:107ns
latency write:43ns

outstanding:
read :9 transactions ,write:3 transactions
burst length:7 ;
transfer size:3;

L2 cache:64K
target performance :gfxbenchmark
MALI-T820 MP1
Manhattan
FPS :2.1fps
BW(rw+wr):255.2MB/frame=536.134MB/s
T-Rex:
FPS:6.5fps
BW(rw+wr):166.7MB/frame=1.08355GB/s
Egypt HD:
FPS:18.5fps
BW(rw+wr):56.1MB/frame=1.03785GB/s
Egypt classic
FPS:18.5fps
BW(rw+wr):20.7MB/frame=836.28MB/s

i）理论计算带宽: rbw=wbw=1.6795GB/s,
busmonitor 测量带宽：rbw = 1.80783GB/s ，wr = 209.408MB/s
ii）读通道带宽与理论计算带宽相差较少，主要是实际GPU会读少量的job descriptor ，但理论计算中忽略job descriptor ；

写通道的带宽与理论带宽相差较大，主要是因GPU的TE进行对写进行了优化，根据波形的busmon_wbw_cnt中的字节总量为

133.1988Mbyte左右，约等于2个16K的FB容量(4096*4096*4*2)大小。

calculate antutu6.0 3D score:

garden: fps*1000*0.62

maroon: fps*1000*1.35

GPU write 测试条件：

1）GPU OD ：600MZH ，MP1；

2）DDR fre ：640M

3) CPU ：1.3GHZ

GPU RW/WR bandwidth ：

t=8.0685S ，BW =3.1014GB/s；

GPU filltare：

t=56.436028S ，fillrate=567.013375M pixels/s；

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