Re: excessive TCP duplicate acks?

From: Andre Oppermann <andre_at_freebsd.org>
Date: Wed, 21 Feb 2007 16:39:06 +0100
Andre Guibert de Bruet wrote:
> On Feb 20, 2007, at 2:31 PM, Andrew Gallatin wrote:
> 
>> Thanks for reporting this.  I'm glad I'm not the only one who is  
>> seeing this!
> 
> 
> I discovered this while testing out a new multi-homed bonded-T1  
> installation. I was wondering why I was getting no more than ~170KB/ s. 
> So far, here are the data points that I have gathered:
> 
> - It affects more than one type of NIC (em0).
> - It happens regardless of hardware checksum enabled status.
> - It happens independent of IP aliasing.
> - I tested GENERIC as of Feb 19 and it is affected.
> - A kernel from December 15th, 2006 exhibits this problem.
> - The affected system is connected to a Linksys 24-port unmanaged  
> gigabit switch (I have the exact same hardware working just fine with  
> 5.5-STABLE on the same switch).

Today I finally got some spare time and tried to track this down.  However
there is no obvious smoking gun to be seen.  I'll dig further.

-- 
Andre
Received on Wed Feb 21 2007 - 15:05:49 UTC

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