# Votre valeur RWIN dans speedguide svp?

**URL:** <https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193>\
**Category:** Pause Café\
**Created:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193 "2016-02-20T16:53:50Z")\
**Posts on this page:** 11\
**Page:** 1

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**Author:** ![isterios](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/i/e95f7d/32.png) [@isterios](https://www.debian-fr.org/u/isterios)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/1 "2016-02-20T16:53:50Z")

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Pouvez vous svp vous connecter sur la page suivante:  
[speedguide.net](http://www.speedguide.net)

cliquer sur TCP/IP analyzer dans la colonne de gauche

et me donner votre valeur dans Default TCP Receive Window (RWIN)

car à priori j’obtiens une valeur très basse: 6144

Merci.

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**Author:** ![Vishnou](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/v/71e660/32.png) [@Vishnou](https://www.debian-fr.org/u/Vishnou)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/2 "2016-02-20T16:53:50Z")

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De mon coté j’obtiens 5840 😕

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**Author:** ![fran.b](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/f/d78d45/32.png) [@fran.b](https://www.debian-fr.org/u/fran.b)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/3 "2016-02-20T16:53:51Z")

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> [@](#):
>
> TCP options string: 020405b40402080a9e5912d50000000001030300  
> MSS: 1460  
> MTU: 1500  
> TCP Window: 5840 (multiple of MSS)  
> RWIN Scaling: 0  
> Unscaled RWIN : 5840  
> Reccomended RWINs: 64240, 128480, 256960, 513920  
> BDP limit (200ms): 234kbps (29KBytes/s)  
> BDP limit (500ms): 93kbps (12KBytes/s)  
> MTU Discovery: ON  
> TTL: 52  
> Timestamps: ON  
> SACKs: ON  
> IP ToS: 00000000 (0)

ça m’émeut pas plus que ça 🙂

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**Author:** ![fran.b](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/f/d78d45/32.png) [@fran.b](https://www.debian-fr.org/u/fran.b)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/4 "2016-02-20T16:53:51Z")

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Bon, je précise: il me semble que linux fait de l’auto-ajustement du paramètre rwin. Je viens d’ailleurs d’apprendre qu’il serait impossible d’ajuster ce paramètres sous linux depuis le 2.6.7  
[http://mepislovers.org/forums/archive/index.php/t-6653.html](http://mepislovers.org/forums/archive/index.php/t-6653.html)  
Maintenant je ne me suis jamais trop penché sur le pbm…

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**Author:** ![Ashgenesis](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/a/57b2e6/32.png) [@Ashgenesis](https://www.debian-fr.org/u/Ashgenesis)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/5 "2016-02-20T16:53:51Z")

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```auto
TCP options string: 020425a401010402 
MSS: 1460 
MTU: 1500 
TCP Window: 17520 (multiple of MSS) 
RWIN Scaling: 0 
Unscaled RWIN : 17520 
Reccomended RWINs: 64240, 128480, 256960, 513920 
BDP limit (200ms): 701kbps (88KBytes/s)
BDP limit (500ms): 280kbps (35KBytes/s) 
MTU Discovery: ON 
TTL: 109 
Timestamps: OFF 
SACKs: ON 
IP ToS: 00000000 (0) 
```

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**Author:** ![MisterFreez](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/m/bb73d2/32.png) [@MisterFreez](https://www.debian-fr.org/u/MisterFreez)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/6 "2016-02-20T16:53:52Z")

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[code]Tested on: 12.30.2007 17:29  
IP address: 82.122.xx.xx

TCP options string: 020405980402080a006bd0340000000001030307  
MSS: 1432  
MTU: 1472  
TCP Window: 5888 (NOT multiple of MSS)  
RWIN Scaling: 7  
Unscaled RWIN : 46  
Reccomended RWINs: 63008, 126016, 252032, 504064  
BDP limit (200ms): 236kbps (29KBytes/s)  
BDP limit (500ms): 94kbps (12KBytes/s)  
MTU Discovery: ON  
TTL: 46  
Timestamps: ON  
SACKs: ON  
IP ToS: 00000000 (0)  
[/code]

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**Author:** ![alexmath](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/a/8edcca/32.png) [@alexmath](https://www.debian-fr.org/u/alexmath)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/7 "2016-02-20T16:53:52Z")

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[code]« [SpeedGuide.net](http://SpeedGuide.net) TCP Analyzer Results »  
Tested on: 12.30.2007 17:51  
IP address: 82.232.xxx.xx

TCP options string: 020405b40402080a00a2a57e0000000001030307  
MSS: 1460  
MTU: 1500  
TCP Window: 5888 (NOT multiple of MSS)  
RWIN Scaling: 7  
Unscaled RWIN : 46  
Reccomended RWINs: 64240, 128480, 256960, 513920  
BDP limit (200ms): 236kbps (29KBytes/s)  
BDP limit (500ms): 94kbps (12KBytes/s)  
MTU Discovery: ON  
TTL: 52  
Timestamps: ON  
SACKs: ON  
IP ToS: 00000000 (0)  
[/code]

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**Author:** ![dimm](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/d/e9bcb4/32.png) [@dimm](https://www.debian-fr.org/u/dimm)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/8 "2016-02-20T16:53:53Z")

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[code]« [SpeedGuide.net](http://SpeedGuide.net) TCP Analyzer Results »  
Tested on: 12.30.2007 18:51  
IP address: [90.47.xx.xxx](http://90.47.xx.xxx)

TCP options string: 020405b40402080a00b883510000000001030307  
MSS: 1460  
MTU: 1500  
TCP Window: 5888 (NOT multiple of MSS)  
RWIN Scaling: 7  
Unscaled RWIN : 46  
Reccomended RWINs: 64240, 128480, 256960, 513920  
BDP limit (200ms): 236kbps (29KBytes/s)  
BDP limit (500ms): 94kbps (12KBytes/s)  
MTU Discovery: ON  
TTL: 44  
Timestamps: ON  
SACKs: ON  
IP ToS: 00000000 (0)  
[/code]

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<div class="post-metadata">

**Author:** ![isterios](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/i/e95f7d/32.png) [@isterios](https://www.debian-fr.org/u/isterios)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/9 "2016-02-20T16:53:53Z")

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Merci à vous.

Oui c’est étrange. Sur un poste Windows, j’obtiens 262800, ça fait une nette différence.

A priori il y aurait moyen de modifier cette valeur dans le fichier /etc/sysctl.conf, mais personnellement j’ai essayé et ça ne change rien au résultat.

Et de la doc sur la modification de la valeur rwin:  
[santa-li.com/linuxonbb.html](http://www.santa-li.com/linuxonbb.html)

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<div class="post-metadata">

**Author:** ![fran.b](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/f/d78d45/32.png) [@fran.b](https://www.debian-fr.org/u/fran.b)\
**Post date:** [Février 20, 2016, 4:53 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/10 "2016-02-20T16:53:53Z")

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[http://ipsysctl-tutorial.frozentux.net/ipsysctl-tutorial.html](http://ipsysctl-tutorial.frozentux.net/ipsysctl-tutorial.html)est très bien fait, on y lit pour les réglages concernés

> [@](#):
>
> The tcp\_rmem variable doesn’t need too much manual tuning however, since the Linux 2.4 kernels has very good autotuning handlings on this aspect

(idem pour tcp\_mem et tcp\_wmem)

et plus loin

> [@](#):
>
> . Do note that you will see almost no gain on slower networks than giga ethernet networks.

À mon avis, c’est discuter de la gomme de pneus pour améliorer les performances d’une mobylette…

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<div class="post-metadata">

**Author:** ![ginkgo\_biloba](https://www.debian-fr.org/user_avatar/www.debian-fr.org/ginkgo_biloba/32/3900_2.png) [@ginkgo\_biloba](https://www.debian-fr.org/u/ginkgo_biloba)\
**Post date:** [Février 20, 2016, 4:54 UTC](https://www.debian-fr.org/t/votre-valeur-rwin-dans-speedguide-svp/11193/11 "2016-02-20T16:54:03Z")

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[quote]TCP options string: 020405b40402080a0003bf9d0000000001030306  
MSS: 1460  
MTU: 1500  
TCP Window: 5888 (NOT multiple of MSS)  
RWIN Scaling: 6  
Unscaled RWIN : 92  
Reccomended RWINs: 64240, 128480, 256960, 513920  
BDP limit (200ms): 236kbps (29KBytes/s)  
BDP limit (500ms): 94kbps (12KBytes/s)  
MTU Discovery: ON  
TTL: 48  
Timestamps: ON  
SACKs: ON  
IP ToS: 00000000 (0[/quote]