[PATCH libdrm] amdgpu: add a faster BO list API
ckoenig.leichtzumerken at gmail.com
Wed Jan 9 18:41:11 UTC 2019
Am 09.01.19 um 17:14 schrieb Marek Olšák:
> On Wed, Jan 9, 2019 at 8:09 AM Christian König
> <ckoenig.leichtzumerken at gmail.com
> <mailto:ckoenig.leichtzumerken at gmail.com>> wrote:
> Am 09.01.19 um 13:36 schrieb Marek Olšák:
>> On Wed, Jan 9, 2019, 5:28 AM Christian König
>> <ckoenig.leichtzumerken at gmail.com
>> <mailto:ckoenig.leichtzumerken at gmail.com> wrote:
>> Looks good, but I'm wondering what's the actual improvement?
>> No malloc calls and 1 less for loop copying the bo list.
> Yeah, but didn't we want to get completely rid of the bo list?
> If we have multiple IBs (e.g. gfx + compute) that share a BO list, I
> think it's faster to send the BO list to the kernel only once.
That's not really faster.
The only thing we safe us is a single loop over all BOs to lockup the
handle into a pointer and that is only a tiny fraction of the overhead.
The majority of the overhead is locking the BOs and reserving space for
What could really help here is to submit gfx+comput together in just one
CS IOCTL. This way we would need the locking and space reservation only
It's a bit of work in the kernel side, but certainly doable.
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