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fcec57856d
the type and state patch tries hard not to form pipelines behind resources that could become head of line blockers. But of course that requires the ability to predict the future, and won't be perfect. This patch reacts to a transaction that has a large response body (defined by either a large content-length header or actually reading a large number of chunked bytes) by cancelling any transactions that have been pipelined down the same connection and rescheduling them elsewhere. It also changes the type of the connection to "solo", which prevents new transactions from being pipelined onto this one and provides class-specific negative feedback to the pipeline manager so that near-future requests to the same host of the same type (e.g. general) will not be pipelined but other types (e.g. img or js/css) can still do that. Content-Length is ideal, because it allows us to identify the problem so early. But even actually reading the document for a fairly long time gives it a fairly high probability of not ending soon. (i.e. long document sizes are spread over a larger range than small ones. duh.) The pref network.http.pipelining.maxsize controls the threshold. I set the default at 300KB, which is roughly the bandwidth delay product of a 2mbit 120ms rtt connection and 1 rtt is mostly what you are giving up by canceling it on one connection and sending it on another. (modulo maybe needing a handshake). |
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