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Kernel: Don't map NIC buffers as uncached

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There is no need for them to be uncached. Having them as uncached killed
the networking performance, over 90% time was spent in kernel out of
which 80% was in checksum calculation and memcpy, half each (measured in
qemu with e1000e)
This commit is contained in:
Bananymous
2026-04-27 19:42:40 +03:00
parent ab8bcbec3e
commit 1486ad7aa5
2 changed files with 5 additions and 5 deletions
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6
kernel/kernel/Networking/E1000/E1000.cpp
View File

@@ -173,7 +173,7 @@ namespace Kernel
BAN::ErrorOr<void> E1000::initialize_rx()
{
m_rx_buffer_region = TRY(DMARegion::create(E1000_RX_BUFFER_SIZE * E1000_RX_DESCRIPTOR_COUNT));
m_rx_buffer_region = TRY(DMARegion::create(E1000_RX_BUFFER_SIZE * E1000_RX_DESCRIPTOR_COUNT, PageTable::MemoryType::Normal));
m_rx_descriptor_region = TRY(DMARegion::create(sizeof(e1000_rx_desc) * E1000_RX_DESCRIPTOR_COUNT));
auto* rx_descriptors = reinterpret_cast<volatile e1000_rx_desc*>(m_rx_descriptor_region->vaddr());
@@ -207,7 +207,7 @@ namespace Kernel
BAN::ErrorOr<void> E1000::initialize_tx()
{
m_tx_buffer_region = TRY(DMARegion::create(E1000_TX_BUFFER_SIZE * E1000_TX_DESCRIPTOR_COUNT));
m_tx_buffer_region = TRY(DMARegion::create(E1000_TX_BUFFER_SIZE * E1000_TX_DESCRIPTOR_COUNT, PageTable::MemoryType::Normal));
m_tx_descriptor_region = TRY(DMARegion::create(sizeof(e1000_tx_desc) * E1000_TX_DESCRIPTOR_COUNT));
auto* tx_descriptors = reinterpret_cast<volatile e1000_tx_desc*>(m_tx_descriptor_region->vaddr());
@@ -304,7 +304,7 @@ namespace Kernel
// FIXME: there isnt really any reason to wait for transmission
write32(REG_TDT, (tx_current + 1) % E1000_TX_DESCRIPTOR_COUNT);
while (descriptor.status == 0)
continue;
Processor::pause();
dprintln_if(DEBUG_E1000, "sent {} bytes", packet_size);

4
kernel/kernel/Networking/RTL8169/RTL8169.cpp
View File

@@ -107,7 +107,7 @@ namespace Kernel
BAN::ErrorOr<void> RTL8169::initialize_rx()
{
m_rx_buffer_region = TRY(DMARegion::create(m_rx_descriptor_count * s_buffer_size));
m_rx_buffer_region = TRY(DMARegion::create(m_rx_descriptor_count * s_buffer_size, PageTable::MemoryType::Normal));
m_rx_descriptor_region = TRY(DMARegion::create(m_rx_descriptor_count * sizeof(RTL8169Descriptor)));
for (size_t i = 0; i < m_rx_descriptor_count; i++)
@@ -144,7 +144,7 @@ namespace Kernel
BAN::ErrorOr<void> RTL8169::initialize_tx()
{
m_tx_buffer_region = TRY(DMARegion::create(m_tx_descriptor_count * s_buffer_size));
m_tx_buffer_region = TRY(DMARegion::create(m_tx_descriptor_count * s_buffer_size, PageTable::MemoryType::Normal));
m_tx_descriptor_region = TRY(DMARegion::create(m_tx_descriptor_count * sizeof(RTL8169Descriptor)));
for (size_t i = 0; i < m_tx_descriptor_count; i++)