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Subject: Re: FreeBSD -> Windows HTTP TCP performance
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>> > net.inet.tcp.delayed_ack: 0
>>
>> It's better to have this turned on.
>
> Some people or webpage recommends turning off delayed_ack for Windows
> clients. Which is true?

Our delayed ack implementation used to be slightly broken, but this was
fixed around 4.5 or so, and is no longer an issue.  Everything should be
good now, so it should be best to leave delayed acks on.

There may be some specific situation in which disabling delayed acks
helps, but I would wager that most people offering this advice are just
parroting something they heard.

Mike "Silby" Silbersack