netdev - Re: [BUG?] tcp: potential bug in tcp_is_sackblock

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Message-ID: <CAA93jw4sQJ63t6tH=SfUPahgprk1Yz4-E3yoMc6yvw=NeN1YBA@mail.gmail.com>
Date:	Sun, 18 Sep 2011 14:04:44 -0700
From:	Dave Taht <dave.taht@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"sfr@...b.auug.org.au" <sfr@...b.auug.org.au>
Subject: Re: [BUG?] tcp: potential bug in tcp_is_sackblock_valid()

On Sun, Sep 18, 2011 at 1:39 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le samedi 17 septembre 2011 à 11:30 -0700, Dave Taht a écrit :
>
>>
>> As cerowrt is one of the few projects enabling sack/dsack/ecn by
>> default, it would be good to know either
>>
>
> dsack is enabled by default on linux, not only cerowt project.
>
>> A) how to test to see if this problem is really a problem
>> B) should we apply the obvious fix
>
> Isnt Cerowrt a router, most of frames are forwarded anyway ?

A very large suite of network test tools runs on the router itself -
netperf, nuttcp, iperf, httping, etc.

netperf, for example, ships, enabled.

This is a means of being able to analyze performance of both the LFN
and wireless from a central point,
from a well defined platform,
without having a random desktop involved.

> This bug is relevant to linux hosts, receiving Duplicate Sacks (RFC
> 2883).
>
>
>
>
>
>



-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://the-edge.blogspot.com
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