Re: Loopback and Nagle's algorithm

[Alejandro Riveira FernÃndez]

El Mon, 11 Apr 2011 22:37:49 -0400
"Adam McLaurin" <lkml@xxxxxxxxxx> escribiÃ:

 Just CCing netdev

> I understand that disabling Nagle's algorithm via TCP_NODELAY will
> generally degrade throughput. However, in my scenario (150 byte
> messages, sending as fast as possible), the actual throughput penalty
> over the network is marginal (maybe 10% at most).
> 
> However, when I disable Nagle's algorithm when connecting over loopback,
> the performance hit is *huge* - 10x reduction in throughput.
> 
> The question is, why is disabling Nagle's algorithm on loopback so much
> worse w.r.t. throughput? Is there anything I can do to reduce the
> incurred throughput penalty?
> 
> Thanks,
> Adam
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