[Mesa-dev] [PATCH 05/18] i965: Reuse our VBO for streaming fast-clear vertices

Martin Peres martin.peres at linux.intel.com
Tue Jul 7 03:42:47 PDT 2015

On 06/07/15 19:43, Kenneth Graunke wrote:
> On Monday, July 06, 2015 11:33:10 AM Chris Wilson wrote:
>> Rather than allocating a fresh page every time we clear a buffer, keep
>> that page around between invocations by tracking the last used offset
>> and only allocating a fresh page when we wrap.
>> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>> ---
>>   src/mesa/drivers/dri/i965/brw_meta_fast_clear.c | 17 ++++++++++++++---
>>   1 file changed, 14 insertions(+), 3 deletions(-)
> This looks okay to me.  Do you have any performance data to justify the
> extra complexity?

I actually get a negative performance improvement on a customer 
benchmark (-1.3%). Could it be because we are waiting on the VBO at some 

What benchmark did you try to get a perf improvement?

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