netdev - Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

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Message-ID: <Pine.LNX.4.64.0704262219200.18515@kivilampi-30.cs.helsinki.fi>
Date:	Thu, 26 Apr 2007 22:30:53 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Chuck Ebbert <cebbert@...hat.com>
cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: Unexcepted latency (order of 100-200 ms) with TCP (packet receive)

On Thu, 26 Apr 2007, Chuck Ebbert wrote:

> Ilpo Järvinen wrote:
> > ...I'm unsure how to continue the investigation from this point onward 
> > and asking for ideas/suggestions or how to rule out more possibilities... 
> > Or is there some knob which I don't know of that should be toggled or 
> > something, is 2.6 network stack expected to behave this way?
> > 
> 
> Try a different network adapter.

Hmm, I thought I had already done this but I just noticed that it is so 
that the adapter was still the same as the other host has two adapter (now 
that I look again). I'll give it a try tomorrow to see if using the 
another adapter makes any difference.

> Try turning off hardware TSO offload:
>   ethtool -K ethX tso off

# ethtool -K eth0 tso off
Cannot set device tcp segmentation offload settings: Operation not 
supported

-- 
 i.