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authorfenner <fenner@FreeBSD.org>1998-05-17 06:39:38 +0000
committerfenner <fenner@FreeBSD.org>1998-05-17 06:39:38 +0000
commite8a137bc32966c8dae0c5b61af86afc27acb77d4 (patch)
tree59e1064ad31f70b5bf815dd35e96ff8263653c21 /etc/mail/README
parent9b04841c1bd3ffd81c2ef5dcbc033b53388c4dea (diff)
downloadFreeBSD-src-e8a137bc32966c8dae0c5b61af86afc27acb77d4.zip
FreeBSD-src-e8a137bc32966c8dae0c5b61af86afc27acb77d4.tar.gz
Turn on TCP_NODELAY on the remote socket, to turn off sender silly window
syndrome avoidance. The combination of SWS avoidance and ack-every-other causes low throughput if the block size divided by the MSS is odd (which is true with the default block size and MSS). Turning on TCP_NODELAY disables the Nagle algorithm and sender SWS avoidance. The rdump request/response protocol can not invoke Nagle and cannot cause SWS, so this has no negative effects.
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