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Aurélien BLONDEL 06-10-2008 08:12 AM

Need informations to point out a potential bug
 
Hi there,

I maybe raised a hare on the Debian Etch (up-to-date) r8169 module.
It was used to manage an onboard Ethernet chipset (mobo is Gigabyte
GA-G33M-DS2R, the chipset is very likely Realtek RTL8111B - complete
designation : dev_8168&subsys_e0001458&rev_01).


The problem is rather strange : it shows up only during communications
in a direction (server to client), only when the client is Windows
(tested with 3 XP pro clients, no other versions available), and only
when it is the client who initiates the transfer. The symptom is rather
simple: silly speeds (generally between 40 and 300 kB/s on a wired 100
Mbps Ethernet LAN).
iperf : 94 Mbps when the server is run on Windows, 14 Mbps when the
server is run on Debian.
Testing with SMB and FTP just confirmed iperf's diagnostic : getting
files using FTP from the client shows a 1.5 MB/s speed. SMB is more
impacted by the problem, probably because of the smb.conf "socket options".


No problem when the transfer is initiated by Debian : putting a file on
a Windows share (usung smbclient put) shows up about 11 Mbps speed.


No problem with the other direction (XP clients to Debian).

Since i was unable to solve the problem, i just added a PCI Ethernet
add-on card. Realtek chipset, managed by the 8139too module :
everything's just flying, thanks.
Since i spent a dozen hours on the problem, i just thought it could be
helpful to report about that.


Questions now : is it a bug ? If yes, how to verify it wasn't already
reported (my Google-Fu didn't find anything, but i'm just a
"grasshopper"...)

At last, if it wasn't already described, how to do it ?
That's my "first time", i don't want to screw up the whole thing ;)

Thanks for any input

--
Aurélien



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Aurélien BLONDEL 06-10-2008 08:13 AM

Need informations to point out a potential bug
 
Whoops, sorry for that. Incomplete mail. Sorry again.

Aurélien BLONDEL a écrit :

Hi there,

I maybe raised a hare on the Debian Etch (up-to-date) r8169 module.
It was used to manage an onboard Ethernet chipset (mobo is Gigabyte
GA-G33M-DS2R, the chipset is very likely Realtek RTL8111B - complete
designation : dev_8168&subsys_e0001458&rev_01).


The problem is rather strange : it shows up only during communications
in a direction (server to client), only when the client is Windows
(tested with 3 XP pro clients, no other versions available), and only
when it is the client who initiates the transfer. The symptom is
rather simple: silly speeds (generally between 40 and 300 kB/s on a
wired 100 Mbps Ethernet LAN).
iperf : 94 Mbps when the server is run on Windows, 14 Mbps when the
server is run on Debian.
Testing with SMB and FTP just confirmed iperf's diagnostic : getting
files using FTP from the client shows a 1.5 MB/s speed. SMB is more
impacted by the problem, probably because of the smb.conf "socket
options".



- Via smblient (put), le serveur Debian envoie un fichier vers un
partage SMB d'un poste client XP : vitesse de transfert environ 11 Mo/s
No problem
No problem with the other direction (XP clients to Debian).


Dans l'autre sens (XP vers Debian), aucun problème constaté.
Pour le cas qui m'intéresse, j'ai réglé la question en... ajoutant une
carte Ethernet PCI (chipset Realtek aussi) et en faisant transiter le
réseau par celle-ci : ça marche très bien maintenant, merci. Mais j'ai
galéré une bonne quinzaine d'heures pour caractériser le problème, alors
si ça peut servir à quelque chose...

Les questions maintenant : comment vérifier que le bug n'a pas déjà été
remonté ? Mon Google-Fu ne m'a pas permis de trouver trace d'un tel
signalement, mais je ne suis qu'un petit scarabée... Si le bug n'a pas
encore été décrit, comment le remonter ? C'est ma toute première fois,
je voudrais pas faire d'impair ;)

Merci d'avance pour vos lumières,

--
Aurélien






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