From: "Leonid Grossman" <[EMAIL PROTECTED]> Date: Thu, 11 Aug 2005 19:05:22 -0400
> Basically, it looks like with SuperTSO most of the traffic in our tests > comes down to the driver with mss 0 (TSO is mostly "off"). > With the original TSO, is was always "on" (see below). > Could you describe how SuperTSO algorithm for switching TSO "on" and > "off" works, it seems to be fairly complex for us to mess with? For a > fast network with extremely low error rate, I'd expect TSO to be on. We build packets as large as the user gives us in sendmsg(), then when ACK's come in openning up the window we either send as much as we can at that moment, or we defer to wait for more space so we can build larger TSO frames. The logic for that decision is in: net/ipv4/tcp_output.c:tcp_tso_should_defer() Keep also in mind that if there is packet loss, TSO is disabled completely. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
