minUsableChannelBytes() — netty Function Reference

Source Code

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2RemoteFlowController.java lines 236–244

    private int minUsableChannelBytes() {
        // The current allocation algorithm values "fairness" and doesn't give any consideration to "goodput". It
        // is possible that 1 byte will be allocated to many streams. In an effort to try to make "goodput"
        // reasonable with the current allocation algorithm we have this "cheap" check up front to ensure there is
        // an "adequate" amount of connection window before allocation is attempted. This is not foolproof as if the
        // number of streams is >= this minimal number then we may still have the issue, but the idea is to narrow the
        // circumstances in which this can happen without rewriting the allocation algorithm.
        return max(ctx.channel().config().getWriteBufferLowWaterMark(), MIN_WRITABLE_CHUNK);
    }