Re: xl(4) & polling

Hi,

just one experience of mine with Realtek 8139. I was not able to FTP 
upgrade Suse 9.2. Data transfer was crashing. After some *research* I 
changed the 8139 and problem was solved. The server was on 3c905B.

Cheers,
Vlado.

On Tue, 10 May 2005, Rob wrote:

> Ruslan Ermilov wrote:
>> Greetings,
>>
>> Those of you wishing to try your xl(4) card under
>> polling(4) are welcome to test this patch:
>>
>
> Ruslan,
>
> Yesterday I discovered that polling of the xl
> interface randomly disrupts an ssh-tunnel of mine.
> I think there's still a subtle, yet critical problem
> with xl polling.
>
> I cannot locate the details of the problem, so I
> will describe the symptoms that I see in my network,
> and why I suspect xl polling.
>
> Here is a sketch of my two private networks:
>
> PC1 - GW1 ~~~~ GW2 - PC2
>
>   PC1 = PC on private network, Intel Pro/100 (fxp)
>   GW1 = Dual-homed Gateway, 2 x 3Com 3c905B-TX (xl)
>   GW2 = Dual-homed Gateway, 2 x RealTek 8139 (rl)
>   PC2 = PC on private network, RealTek 8139 (rl)
>   ~~~~ = Internet
>
> All computers are running 5-Stable, as of May 10.
> All, but PC1 with fxp, use polling, with:
>   options DEVICE_POLLING
>   options HZ=1000
>
>
> GW2 redirects (with natd) port 2200 to PC2.
>
> PC1 establishes an ssh-tunnel to PC2:
>  PC1$ ssh -p 2200 -N -f -R 2000:localhost:22 GW2
>
> Then on PC2, I can use this tunnel to connect
> directly to PC1, for example to run xbiff:
>  PC2$ ssh -Y -p 2000 localhost xbiff
>
> This works beautifully, but every now and then the
> ssh-tunnel connection is 'closed' for no reason
> (the ssh-tunnel itself remains, but the connection
> is closed).
> This happens at least once an hour, seemingly at
> random.
>
> After some trial and error, I discovered that the
> polling of the xl devices (GW1) is the culprit.
>
> As soon as I disable the polling for the xl devices
> on GW1, the ssh-tunnel connection is not disrupted
> anymore.
>
> -----
>
> GW1 is also a production server, so experimenting
> is rather limited. However, I can run tests, if that
> would help resolve the problem.
>
> Here you can find some relevant info on GW1 with the
> xl devices:
>
> dmesg output:
>  http://surfion.snu.ac.kr/~lahaye/dmesg.boot
> kernel configuration:
>  http://surfion.snu.ac.kr/~lahaye/MYKERNEL
> /boot/loader.conf:
>  http://surfion.snu.ac.kr/~lahaye/loader.conf
>
> Regards,
> Rob.
>
>
>
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