[toast0]

I've run a big webserver that served a decent size apk/other app downloads (and a bunch of small files and what nots). I had to set the maximum outgoing window to keep the overall memory within limits.

IIRC, servers were 64GB of ram and sendbufs were capped at 2MB. I was also dealing with a kernel deficiency that would leave the sendbuf allocated if the client disappeared in LAST_ACK. (This stems from a deficiency in the state description from the 1981 rfc written before my birth)

[dan-robertson]

I wonder if there’s some way to reduce this server-side memory requirement. I thought that was part of the point of sendfile but I might be mistaken. Unfortunately sendfile isn’t so suitable nowadays because of tls. But maybe if you could do tls offload and do sendfile then an OS could be capable of needing less memory for sendbufs.