netdev - Re: TCP connection stops after high load.

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Message-Id: <20070416.121746.39159168.davem@davemloft.net>
Date:	Mon, 16 Apr 2007 12:17:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jheffner@....edu
Cc:	coroberti@...il.com, netdev@...r.kernel.org,
	greearb@...delatech.com
Subject: Re: TCP connection stops after high load.

From: John Heffner <jheffner@....edu>
Date: Mon, 16 Apr 2007 15:11:07 -0400

> I don't know if this qualifies as an unconditional bug.  The commit 
> above was actually a bugfix so that the limits were not higher than 
> total memory on some systems, but had the side effect that it made them 
> even smaller on your particular configuration.  Also, having initial 
> sysctl values that are conservatively small probably doesn't qualify as 
> a bug (for patching stable trees).  You might ask the -stable 
> maintainers if they have a different opinion.
> 
> For most people, 2.6.19 and 2.6.20 work fine.  For those who really care 
> about the tcp_mem values (are using a substantial fraction of physical 
> memory for TCP connections), the best bet is to set the tcp_mem sysctl 
> values in the startup scripts, or use the new initialization function in 
> 2.6.21.

What's most important is determining if that tcp_mem[] patch actually
fixes his problem, so it is his responsibility to see whether this
is the case.

If it does fix the problem, I'm happy to submit the backport to -stable.

But until such tests are made, it's just speculation whether the patch
fixes the problem or not, and therefore there is zero justification to
submit it to -stable.
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