TCP delayed acks not being delayed?

RW list-freebsd-2004 at
Sat Mar 25 02:37:33 UTC 2006

On Saturday 25 March 2006 02:09, RW wrote:
> I have a 1MB/0.25Mb ADSL connection and have an IPFW rule to prioritize
> outgoing empty acks. If I download a single file with kget at 100 kbytes/s,
> I see that the rule gets hit at a rate of  50/s: ie a little under 1
> empty-ack per incoming packet.
> I have:
> net.inet.tcp.delacktime: 100
> net.inet.tcp.delayed_ack: 1
> which I thought should limit each TCP connection to <=10 empty acks per
> second

Sorry, I should have mentioned it's 6.0-RELEASE-p4.

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