On 28/02/14 17:32, Ian Romanick wrote:
> On 02/21/2014 07:04 PM, Emil Velikov wrote:
>> The variable name states megabytes, while we calculate the amount in
>> kilobytes. Correct this by dividing with the correct amount.
>>
>> Cc: "10.0 10.1" <[email protected]>
>> Cc: Ian Romanick <[email protected]>
>> Signed-off-by: Emil Velikov <[email protected]>
>> ---
>> src/mesa/drivers/dri/i915/intel_screen.c | 2 +-
>> src/mesa/drivers/dri/i965/intel_screen.c | 2 +-
>> 2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/src/mesa/drivers/dri/i915/intel_screen.c
>> b/src/mesa/drivers/dri/i915/intel_screen.c
>> index 296df16..884fdb5 100644
>> --- a/src/mesa/drivers/dri/i915/intel_screen.c
>> +++ b/src/mesa/drivers/dri/i915/intel_screen.c
>> @@ -744,7 +744,7 @@ i915_query_renderer_integer(__DRIscreen *psp, int
>> param, unsigned int *value)
>> * (uint64_t) system_page_size;
>>
>> const unsigned system_memory_megabytes =
>> - (unsigned) (system_memory_bytes / 1024);
>> + (unsigned) (system_memory_bytes / (1024 * 1024));
>
> I don't think this is correct. When I run piglit's
> glx-query-renderer-coverage, it says
>
> glXQueryRendererIntegerMESA(GLX_RENDERER_VIDEO_MEMORY_MESA) values:
> 1534
>
> That's 1.5GiB, and that's the value I expect. I guess the variable
> system_memory_bytes should be called system_memory_kbytes instead.
>
> I see you have similar code in other patches in the series. Does
> glx-query-renderer-coverage give sensible values in those drivers?
>
I can only test swrast (both classic and gallium, patches 11 and 24) and
gallium nouveau. The former gives a sensible result for my 4GiB machine.
glXQueryRendererIntegerMESA(GLX_RENDERER_VIDEO_MEMORY_MESA) values:
3957
$ man sysconf
PAGESIZE - _SC_PAGESIZE
Size of a page in bytes.
_SC_PHYS_PAGES
The number of pages of physical memory.
... so I'm not sure how we get such a difference.
Mind checking if the following gives reasonable result on your system ?
printf("%ul\n", sysconf(_SC_PAGE_SIZE)*sysconf(_SC_PHYS_PAGES);
-Emil
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