maskit commented on issue #11518:
URL:
https://github.com/apache/trafficserver/issues/11518#issuecomment-2216497991
There are allocators for for H3 and QUIC, although some are not used:
```
$ git grep ClassAllocator src/proxy/http3/
src/proxy/http3/Http3Frame.cc:ClassAllocator<Http3Frame>
http3FrameAllocator("http3FrameAllocator");
src/proxy/http3/Http3Frame.cc:ClassAllocator<Http3DataFrame>
http3DataFrameAllocator("http3DataFrameAllocator");
src/proxy/http3/Http3Frame.cc:ClassAllocator<Http3HeadersFrame>
http3HeadersFrameAllocator("http3HeadersFrameAllocator");
src/proxy/http3/Http3Frame.cc:ClassAllocator<Http3SettingsFrame>
http3SettingsFrameAllocator("http3SettingsFrameAllocator");
```
```
$ git grep ClassAllocator src/iocore/net/ | grep -i quic
src/iocore/net/P_QUICNet.h:extern ClassAllocator<QUICPollEvent>
quicPollEventAllocator;
src/iocore/net/P_QUICNetVConnection.h:extern
ClassAllocator<QUICNetVConnection> quicNetVCAllocator;
src/iocore/net/QUICNet.cc:ClassAllocator<QUICPollEvent>
quicPollEventAllocator("quicPollEvent");
src/iocore/net/QUICNetVConnection.cc:ClassAllocator<QUICNetVConnection>
quicNetVCAllocator("quicNetVCAllocator");
```
But I don't think these ae the cause.
The heaviest user of freelist on the benchmark is probably
`udpPacketAllocator` (and `ioBlockAllocator` used by UDPPacket class).
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