Hi,
Thanks for the reply.
2011/8/4 Michel Dänzer <[email protected]>:
> On Don, 2011-08-04 at 14:46 +0800, Chen Jie wrote:
>>
>> We're running RS780E on a MIPS64 compatible platform, and encounter
>> screen corruption sometimes:
>> * Do 'x11perf -compwinwin500' -- Window decoration and the background
>> corrupt
>> (http://dev.lemote.com/files/upload/software/temp/x11perf-corrupt.png)
>> * Hardware Accelerated video playback(video-pipe branch of mesa) --
>> both playback and the desktop:
>> -
>> http://dev.lemote.com/files/upload/software/temp/newmobcal1920-playback.png
>> -
>> http://dev.lemote.com/files/upload/software/temp/newmobcal1920-desktop-corrupt.png
>> - Related thread:
>> http://lists.freedesktop.org/archives/mesa-dev/2011-August/010064.html
>
> The video decoding corruption may be due to the pipe-video code not
> working properly on all hardware yet.
>
> The rest looks like more or less random BO corruption.
The x11perf test causes the corruption each time.
>
>
>> 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.
Regards,
- Chen Jie
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <sys/mman.h>
#include <stdio.h>
#include <string.h>
int main()
{
void *fbmem;
int fd;
int fb_offset = 0x100000;
struct timeval tv1, tv2;
int i;
fd = open("/dev/mem", O_RDWR);
if(fd < 0) {
printf("Open %s failed", "/dev/mem");
return -1;
}
/* mmap 16M fbmem */
fbmem = mmap(NULL, 16*1024*1024, PROT_WRITE, MAP_SHARED, fd, fb_offset);
if(fbmem == NULL) {
printf("mmap fbmem failed\n");
return -1;
}
gettimeofday(&tv1, NULL);
for(i=0; i<10; i++)
memset(fbmem, 0x55, 16*1024*1024);
gettimeofday(&tv2, NULL);
printf("fbmem speed is %f\n",
16*10.0/((tv2.tv_sec+tv2.tv_usec/1000000)-(tv1.tv_sec+tv1.tv_usec/1000000)));
return 0;
}
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