On 1/9/12 11:22 PM, Henry S. Thompson wrote: > Corinna Vinschen writes: > >> it's nice to know that you could increase the performance by increasing >> the buffer sizes. However, I'm reluctant to implement this as a generic >> option. As far as I know the socket buffers are taken from nonpaged pool, >> so generically using 2 Meg buffers will take a lot of precious resources. > > And contribute to bufferbloat problems [1] [2] elsewhere!
Large socket buffers don't contribute bufferbloat: a socket's send-buffer holds bytes, not packets. It sits above TCP on the networking stack, thus doesn't affect TCP's flow control decisions. Bufferbloat happens when deep IP-packet buffers confuse TCP's congestion avoidance, not when the OS feeds bytes to TCP more efficiently. Of course, using a larger socket buffer _can_ increase the send(2)-to-wire latency, but that's not quite the same thing as bufferbloat.
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