DragonFly BSD
DragonFly kernel List (threaded) for 2004-07
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T1 troubles fixed (was HEADS UP: T1 troubles w/ dragonflybsd.org)

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 5 Jul 2004 02:41:06 -0700 (PDT)

    I've solved the T1 issues for now.  It turns out that my Cisco was 
    set to default queueing limits (fair-queue 75) and throwing away output
    packets due to the load.  So many drops were occuring that TCP backoff
    was reducing output throughput to 800Kbits/sec instead of staying pegged
    at 1.5MBits/sec.

    My servers have net.inet.tcp.inflight_enable turned on which means,
    theoretically, that the TCP windows will not get out of control if I
    increase the queue limits, so that is what I did.  Now the output
    throughput is pegged at 1.5MBits/sec and data flow seems to be running
    smoothly, with only occassional bursts of drops.

    leaf.dragonflybsd.org users may notice some lag at times, but it should
    mostly be ok.

					Matthew Dillon 

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