excessive duplicate ACKs

[Andre Oppermann]

On 15.08.2011 19:41, Sean Bruno wrote:
> On Mon, 2011-08-15 at 06:53 -0700, Darren Baginski wrote:
>> Hi!
>>
>> Could please some tell me if bug
>> http://lists.freebsd.org/pipermail/freebsd-net/2011-February/027895.html
>> was fixed in any release?
>> If not is there any workaround?
>> I'm still facing with it 8.2-RELEASE.
>> Sorry if that question was answered already. Can't find an answer.
>
> It looks like it was patched in 8 here:
> http://svnweb.freebsd.org/base?view=revision&revision=222934

There is a related 'bug' where TCP sends a large number of ACKs, or
rather unnecessary window updates.  This happens when the application
does limited reads and is just as fast with reading the socket as the
network delivers data.

The details plus a patch I wrote some time ago is in this PR:
  http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/116335 Excessive TCP window updates

-- 
Andre