[Bug 98478] glCopyTexSubImage2D is much slower than glDrawArrays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98478

--- Comment #4 from Dongseong Hwang <dongseong.hwang at intel.com> ---
Here's intel_gpu_top data

When using glDrawArrays

render busy:  48%: █████████▋                             render space:
67/16384


       task  percent busy
         CS:  49%: █████████▉              vert fetch: 650289482
(650202512/sec)
        GAM:  43%: ████████▋               prim fetch: 216764414
(216735424/sec)
         VS:  11%: ██▎                  VS invocations: 636105016
(636047896/sec)
        SVG:  10%: ██                   GS invocations: 0 (0/sec)
         VF:  10%: ██                        GS prims: 0 (0/sec)
       GAFS:   9%: █▉                   CL invocations: 216759538
(216730978/sec)
         CL:   9%: █▉                        CL prims: 97832823 (97804263/sec)
         SF:   5%: █                    PS invocations: 18278204160
(-430295856/sec)
         DS:   4%: ▉                    PS depth pass: 4741623475
(77865535/sec)
        SOL:   3%: ▋                    
         GS:   3%: ▋                    
        SDE:   2%: ▌                    
        TDG:   2%: ▌                    
         TE:   1%: ▎                    
         HS:   1%: ▎                    
       GAFM:   1%: ▎                    
         RS:   1%: ▎                    
        VFE:   0%:                      
        TSG:   0%:                      
       URBM:   0%:                      


When using glCopyTexSubImage2D

render busy:  53%: ██████████▋                            render space:
38/16384


       task  percent busy
         CS:  55%: ███████████             vert fetch: 421770029 (15081065/sec)
        GAM:  49%: █████████▉              prim fetch: 140591035 (5026989/sec)
         VS:  14%: ██▉                  VS invocations: 411982523
(14758688/sec)
        SVG:  14%: ██▉                  GS invocations: 0 (0/sec)
       GAFS:  12%: ██▌                       GS prims: 0 (0/sec)
         VF:  12%: ██▌                  CL invocations: 140587183 (5027260/sec)
         CL:  11%: ██▎                       CL prims: 63411022 (2244392/sec)
         SF:   7%: █▌                   PS invocations: 9766779712
(286387776/sec)
         DS:   6%: █▎                   PS depth pass: 2582256091
(72883919/sec)
        SOL:   5%: █                    
         GS:   5%: █                    
        SDE:   3%: ▋                    
        TDG:   3%: ▋                    
         HS:   2%: ▌                    
         TE:   2%: ▌                    
       GAFM:   1%: ▎                    
        TSG:   0%:                      
         RS:   0%:                      
        VFE:   0%:                      
       URBM:   0%:

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