This release enables GSO (Generic Segmentation Offload) in the send path, drastically increasing the packet send rate. Without GSO, quic-go had to use a single (sendmsg) syscall for every UDP datagram sent. GSO allows us to pass one giant (up to 64k) datagram to the sendmsg syscall, and have the kernel chop it into MTU sized (~1300 bytes) datagrams before sending them out on the wire. For more details on syscall optimizations, CloudFlare published an excellent blog post about this a while ago. GSO is currently only available on Linux (and with kernels >4.18).
Users who are using the same net.PacketConn for QUIC and to send out non-QUIC packets now need to call the newly introduced OptimizeConn function before passing the connection to the Transport. Otherwise, calls to WriteTo will fail after GSO support was enabled. Users who are not using the same net.PacketConn in this way don't need to change anything.
We also continued our effort to further reduce allocations during data transfers (#3526). Work on improving performance even further will continue in future releases.
Other Notable Changes
http3: The server now returns http.ErrServerClosed instead of quic.ErrServerClosed (#3900)
quic-go now correctly deals with super-short idle timeouts (#3909)
uint62 overflows are now correctly handled in the Config (#3866)
only run DPLPMTUD (RFC 8899) on connections that support setting the DF bit (#3879)
switch to the packet number length derivation logic described in the RFC (#3885)
fix panics when closing an uninitialized Transport (#3908)
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Bumps github.com/quic-go/quic-go from 0.35.1 to 0.36.0.
Release notes
Sourced from github.com/quic-go/quic-go's releases.
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Commits
da298d0docs: improve documentation of OptimizeConn (#3910)8352e5dcheck for uninitialized fields when closing the Transport (#3908)9acce3chttp3: return http.ErrServerClosed instead of quic.ErrServerClosed (#3900)e4fe289docs: add detailed description of the quic package (#3902)28d5106wire: switch to crypto/rand for greased transport parameter generation (#3904)f57f876respect minimum idle timeout of 3 PTOs (#3909)85764dadocs: improve doc comments for the ConnectionState fields (#3901)30527c5frame fuzzer: handle frames one by one (#3884)c52b583Merge pull request #3889 from quic-go/ackhandler-unexport-packete45c460ackhandler: don't allocate a packet struct for non-ack-eliciting packetsDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
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