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[dxvk] Tune small buffer allocation sizes

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The pool allocator works on powers of two, so buffers should too.
This commit is contained in:
Philip Rebohle 2024-09-18 17:37:55 +02:00 committed by Philip Rebohle
parent 3faa1a76da
commit 35fea6475d
2 changed files with 39 additions and 22 deletions
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35
src/dxvk/dxvk_buffer.cpp
View File

@ -22,31 +22,38 @@ namespace dxvk {
VkDeviceSize sliceAlignment = computeSliceAlignment(device);
m_physSliceLength = createInfo.size;
m_physSliceStride = align(createInfo.size, sliceAlignment);
m_physSliceCount = std::max<VkDeviceSize>(1, 256 / m_physSliceStride);
// Limit size of multi-slice buffers to reduce fragmentation
constexpr VkDeviceSize MaxBufferSize = 256 << 10;
// Determine optimal allocation size for the buffer. If the buffer
// is small enough to hit the pool allocator, round its size up to
// a power of two to minimize the amount of internal fragmentation.
VkDeviceSize sliceSize = align(createInfo.size, sliceAlignment);
m_allocationSize = std::max(MinAllocationSize, sliceSize);
m_physSliceMaxCount = MaxBufferSize >= m_physSliceStride
? MaxBufferSize / m_physSliceStride
: 1;
if (m_allocationSize <= DxvkPoolAllocator::MaxSize)
m_allocationSize = (VkDeviceSize(-1) >> bit::lzcnt(m_allocationSize - 1u)) + 1u;
m_maxAllocationSize = MaxSlicesPerAllocation * sliceSize;
m_maxAllocationSize = std::max(m_maxAllocationSize, MinAllocationSizeLimit);
m_maxAllocationSize = std::min(m_maxAllocationSize, MaxAllocationSize);
// Allocate the initial set of buffer slices. Only clear
// buffer memory if there is more than one slice, since
// we expect the client api to initialize the first slice.
m_buffer = allocBuffer(m_physSliceCount, m_physSliceCount > 1);
bool hasMultipleSlices = m_allocationSize >= sliceSize + sliceSize;
m_buffer = allocBuffer(m_allocationSize, hasMultipleSlices);
m_physSlice.handle = m_buffer.buffer;
m_physSlice.offset = m_buffer.getBaseOffset();
m_physSlice.length = m_physSliceLength;
m_physSlice.mapPtr = m_buffer.memory.mapPtr(0);
m_lazyAlloc = m_physSliceCount > 1;
m_lazyAlloc = hasMultipleSlices;
} else {
m_physSliceLength = createInfo.size;
m_physSliceStride = createInfo.size;
m_physSliceCount = 1;
m_physSliceMaxCount = 1;
m_allocationSize = createInfo.size;
m_buffer = createSparseBuffer();
@ -75,14 +82,14 @@ namespace dxvk {
m_shaderStages (util::shaderStages(createInfo.stages)) {
m_physSliceLength = createInfo.size;
m_physSliceStride = createInfo.size;
m_physSliceCount = 1;
m_physSliceMaxCount = 1;
m_physSlice.handle = importInfo.buffer;
m_physSlice.offset = importInfo.offset;
m_physSlice.length = createInfo.size;
m_physSlice.mapPtr = importInfo.mapPtr;
m_allocationSize = createInfo.size;
m_lazyAlloc = false;
}
@ -98,10 +105,10 @@ namespace dxvk {
}
DxvkBufferHandle DxvkBuffer::allocBuffer(VkDeviceSize sliceCount, bool clear) const {
DxvkBufferHandle DxvkBuffer::allocBuffer(VkDeviceSize allocationSize, bool clear) const {
VkBufferCreateInfo info = { VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO };
info.flags = m_info.flags;
info.size = m_physSliceStride * sliceCount;
info.size = allocationSize;
info.usage = m_info.usage;
info.sharingMode = VK_SHARING_MODE_EXCLUSIVE;

24
src/dxvk/dxvk_buffer.h
View File

@ -130,6 +130,13 @@ namespace dxvk {
*/
class DxvkBuffer : public DxvkPagedResource {
friend class DxvkBufferView;
constexpr static VkDeviceSize MaxAllocationSize = DxvkPageAllocator::PageSize;
constexpr static VkDeviceSize MinAllocationSize = DxvkPoolAllocator::MinSize;
constexpr static VkDeviceSize MinAllocationSizeLimit = MaxAllocationSize / 32u;
constexpr static uint32_t MaxSlicesPerAllocation = 64u;
public:
DxvkBuffer(
@ -280,15 +287,17 @@ namespace dxvk {
// backing buffer and add all slices to the free list.
if (unlikely(m_freeSlices.empty())) {
if (likely(!m_lazyAlloc)) {
DxvkBufferHandle handle = allocBuffer(m_physSliceCount, true);
DxvkBufferHandle handle = allocBuffer(m_allocationSize, true);
for (uint32_t i = 0; i < m_physSliceCount; i++)
for (uint32_t i = 0; (i + 1) * m_physSliceStride <= m_allocationSize; i++)
pushSlice(handle, i);
m_buffers.push_back(std::move(handle));
m_physSliceCount = std::min(m_physSliceCount * 2, m_physSliceMaxCount);
if (2u * m_allocationSize <= m_maxAllocationSize)
m_allocationSize *= 2u;
} else {
for (uint32_t i = 1; i < m_physSliceCount; i++)
for (uint32_t i = 1; (i + 1) * m_physSliceStride <= m_allocationSize; i++)
pushSlice(m_buffer, i);
m_lazyAlloc = false;
@ -342,8 +351,9 @@ namespace dxvk {
uint32_t m_lazyAlloc = false;
VkDeviceSize m_physSliceLength = 0;
VkDeviceSize m_physSliceStride = 0;
VkDeviceSize m_physSliceCount = 1;
VkDeviceSize m_physSliceMaxCount = 1;
VkDeviceSize m_allocationSize = 0;
VkDeviceSize m_maxAllocationSize = 0;
std::vector<DxvkBufferHandle> m_buffers;
std::vector<DxvkBufferSliceHandle> m_freeSlices;
@ -362,7 +372,7 @@ namespace dxvk {
}
DxvkBufferHandle allocBuffer(
VkDeviceSize sliceCount,
VkDeviceSize allocationSize,
bool clear) const;
DxvkBufferHandle createSparseBuffer() const;