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Try factoring out a mutex to see if its faster.

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This commit is contained in:
Adam Ierymenko 2020-11-17 15:48:15 -05:00
parent 2fcc344299
commit 982c32322b
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GPG Key ID: C8877CF2D7A5D7F3
2 changed files with 32 additions and 15 deletions
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41
osdep/LinuxEthernetTap.cpp
View File

@ -92,12 +92,17 @@ LinuxEthernetTap::LinuxEthernetTap(
_homePath(homePath),
_mtu(mtu),
_fd(0),
_enabled(true)
_enabled(true),
_bufferReadPtr(0),
_bufferWritePtr(0)
{
static std::mutex s_tapCreateLock;
char procpath[128],nwids[32];
struct stat sbuf;
for(unsigned long i=0;i<ZT_BUFFER_POOL_SIZE;++i)
_buffers[i] = 0;
// Create only one tap at a time globally.
std::lock_guard<std::mutex> tapCreateLock(s_tapCreateLock);
@ -252,15 +257,14 @@ LinuxEthernetTap::LinuxEthernetTap(
if (FD_ISSET(_fd,&readfds)) {
for(;;) { // read until there are no more packets, then return to outer select() loop
if (!buf) {
std::lock_guard<std::mutex> l(_buffers_l);
if (_buffers.empty()) {
buf = malloc(ZT_TAP_BUF_SIZE);
if (!buf)
for(unsigned int k=0;k<ZT_BUFFER_POOL_SIZE;++k) {
buf = reinterpret_cast<void *>(_buffers[_bufferReadPtr++ & ZT_BUFFER_POOL_MASK].exchange(0));
if (buf)
break;
} else {
buf = _buffers.back();
_buffers.pop_back();
}
buf = malloc(ZT_TAP_BUF_SIZE);
if (!buf)
continue;
}
n = (int)::read(_fd,reinterpret_cast<uint8_t *>(buf) + r,ZT_TAP_BUF_SIZE - r);
@ -294,16 +298,22 @@ LinuxEthernetTap::LinuxEthernetTap(
MAC to,from;
std::pair<void *,int> qi;
while (_tapq.get(qi)) {
uint8_t *const b = reinterpret_cast<uint8_t *>(qi.first);
uint8_t *b = reinterpret_cast<uint8_t *>(qi.first);
if (b) {
to.setTo(b, 6);
from.setTo(b + 6, 6);
unsigned int etherType = Utils::ntoh(((const uint16_t *)b)[6]);
_handler(_arg, nullptr, _nwid, from, to, etherType, 0, (const void *)(b + 14),(unsigned int)(qi.second - 14));
{
std::lock_guard<std::mutex> l(_buffers_l);
_buffers.push_back(qi.first);
for(unsigned int k=0;k<ZT_BUFFER_POOL_SIZE;++k) {
uintptr_t zero = 0;
if (_buffers[_bufferWritePtr++ & ZT_BUFFER_POOL_MASK].compare_exchange_strong(zero,reinterpret_cast<uintptr_t>(b))) {
b = nullptr;
break;
}
}
if (b)
free(b);
} else break;
}
});
@ -321,8 +331,11 @@ LinuxEthernetTap::~LinuxEthernetTap()
_tapReaderThread.join();
_tapProcessorThread.join();
for(std::vector<void *>::iterator i(_buffers.begin());i!=_buffers.end();++i)
free(*i);
for(unsigned int k=0;k<ZT_BUFFER_POOL_SIZE;++k) {
void *p = reinterpret_cast<void *>(_buffers[k].load());
if (p)
free(p);
}
std::vector< std::pair<void *,int> > dv(_tapq.drain());
for(std::vector< std::pair<void *,int> >::iterator i(dv.begin());i!=dv.end();++i) {
if (i->first)

6
osdep/LinuxEthernetTap.hpp
View File

@ -28,6 +28,9 @@
#include "EthernetTap.hpp"
#include "BlockingQueue.hpp"
#define ZT_BUFFER_POOL_SIZE 64
#define ZT_BUFFER_POOL_MASK 63U
namespace ZeroTier {
class LinuxEthernetTap : public EthernetTap
@ -73,7 +76,8 @@ private:
std::thread _tapReaderThread;
std::thread _tapProcessorThread;
std::mutex _buffers_l;
std::vector<void *> _buffers;
std::atomic<uintptr_t> _buffers[ZT_BUFFER_POOL_SIZE];
std::atomic<uintptr_t> _bufferReadPtr,_bufferWritePtr;
BlockingQueue< std::pair<void *,int> > _tapq;
};