Great detective work.<p>Before people go off reducing tcp_rmem too low, I thought I&#x27;d explain its actual purpose.<p>A TCP sender will only send data of the receiver has buffer space available. With 100msec of latency, at 1Gbit&#x2F;sec there can be 12MBytes of data &quot;on the wire&quot;. If a retransmit is necessary, you can multiply that by a number of round trips (say 2 or 3?) to get the needed amount of receive buffer to keep the sender sending. Otherwise per-connection throughput is reduced linearly with the tcp_rmem size.<p>I mention this because objects in a CDN are usually pretty small, and lower values of tcp_rmem may be ok for them.<p>And really I mention this hoping it motivates someone to fix the bug.