[Help][RS780E][mipsel]Screen corruption sometimes

[Chen Jie]

Hi,

2011/8/4 Michel Dänzer <michel at daenzer.net>:
> You can try booting with radeon.test=1 and see in dmesg if the transfer
> tests triggered by that succeed.
Seems has some test failure, see attachment radeon.test.log

>
>> >> Any idea? (BTW, don't know if related, but the bandwidth of separated
>> >> video ram is really low, about 14MB/s for write op)
>> >
>> > How do you measure it?
>> mmap the VRAM and write to it. Attachment is the test code.
>
> I wonder if memset might use byte-sized writes, but anyway direct CPU
> access to VRAM is known to be slow with discrete GPUs, especially
> without write combining. The userspace drivers mostly avoid it in favour
> of GPU transfers. You can try x11perf -shmput500 -shmget500 or booting
> with radeon.benchmark=1 to get some numbers for those.
radeon.benchmark=1：
[    5.738281] radeon: dma 1024 bo moves of 1024kb from 2 to 4 in
5117ms (204kb/ms 204000kb/s 199M/s)
[   10.851562] radeon: blit 1024 bo moves of 1024kb from 2 to 4 in
5113ms (205kb/ms 205000kb/s 200M/s)
[   12.976562] radeon: dma 1024 bo moves of 1024kb from 4 to 2 in
2121ms (494kb/ms 494000kb/s 482M/s)
[   15.093750] radeon: blit 1024 bo moves of 1024kb from 4 to 2 in
2117ms (495kb/ms 495000kb/s 483M/s)
Details see attachment:  radeon.benchmark.log

----
x11perf -shmput500 -shmget500：
Sync time adjustment is 0.0000 msecs.

    800 reps @   0.0017 msec (603000.0/sec): ShmPutImage 500x500 square
    800 reps @   5.8503 msec (   171.0/sec): ShmPutImage 500x500 square
    800 reps @  12.5863 msec (    79.5/sec): ShmPutImage 500x500 square
    800 reps @  12.6590 msec (    79.0/sec): ShmPutImage 500x500 square
    800 reps @  12.7442 msec (    78.5/sec): ShmPutImage 500x500 square
   4000 trep @   8.7683 msec (   114.0/sec): ShmPutImage 500x500 square

   2800 reps @   1.8089 msec (   553.0/sec): ShmGetImage 500x500 square
   2800 reps @   1.7870 msec (   560.0/sec): ShmGetImage 500x500 square
   2800 reps @   1.7864 msec (   560.0/sec): ShmGetImage 500x500 square
   2800 reps @   1.7951 msec (   557.0/sec): ShmGetImage 500x500 square
   2800 reps @   1.7771 msec (   563.0/sec): ShmGetImage 500x500 square
  14000 trep @   1.7909 msec (   558.0/sec): ShmGetImage 500x500 square



Regards,
- Chen Jie
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