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Re: [tcpm] TCP Tuning for HTTP - update

Jeremy Harris <jgh@wizmail.org> Fri, 19 August 2016 10:55 UTC

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From: Jeremy Harris <jgh@wizmail.org>
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Date: Fri, 19 Aug 2016 11:50:26 +0100
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Subject: Re: [tcpm] TCP Tuning for HTTP - update
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On 18/08/16 18:50, Joe Touch wrote:
> On the issue of ACK compression effects:
> 
> 
> On 8/17/2016 10:38 PM, Willy Tarreau wrote:
>>>     - watch out for ACK compression effects (turn it off in favor of ABC
>>>> if you can)
>> It does not happen that much with HTTP. Many connections on the server side
>> see only one, sometimes two requests, and most responses are small (about
>> 20kB on average, with favicon fitting in a single segment). Note, I'm talking
>> about observations on average web sites.
> The effect is more pronounced for smaller responses, for any response
> using an odd number of packets. The last odd packet will be stalled
> because the client needs to timeout before it will send an ACK for a
> single segment (it's waiting for the second segment).

Should we be pushing for the delayed-ack timer to be autotuned?
-- 
Cheers,
  Jeremy

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