[vpn-help] Windows 7 32bit poor performance and timeouts

[Matthew Grooms]

On 10/11/2010 2:46 PM, Matthew Grooms wrote:
> On 10/11/2010 12:45 PM, Bernd Muschke wrote:
>> Hi Matthew,
>>
>> LSO was a good hint, thank you.
>>
>> Today we did some tests with our "bad" adapters all with current drivers.
>>
>> Intel:
>> 82566DM-2 and PRO/1000 MT are only ok when you switch off LSO
>>
>> Broadcom:
>> 57xx does not provide such a switch, we switched off every other
>> available option one at a time without success
>>
>>
>> Do you have the ability to test such an adapter? You can see immediately
>> if it is ok or not when you simply copy a 20MB file with Winscp or any
>> other client which shows you transfer rates. The rates are very low and
>> change all the time and might even drop completely.
>>
>> While you don't transfer files you might not even notice that there is a
>> problem. We used our "bad" adpaters all day long with Putty and thought
>> that everything was ok.
>>
>> So now we know that we can add Intel cards to our Broadcom desktops and
>> switch off LSO to bypass our problem but this is not the best
>> solution.....
>>
>
> Hi Bernd,
>
> I just ordered both a PCI-X and a PCI-e version of the Intel PRO/1000 MT
> adapters. After a bit of googling, it would appear that Broadcom has a
> tool called BACS that can be used to disable the LSO support feature of
> Netxtreme cards. I'm not sure if this is the right version for your
> particular adapter. The version.txt file says it supports Vista but not
> Windows 7. I would give it a try anyway as Vista and Windows 7 are very
> similar OS's ...
>
> http://www.broadcom.com/support/ethernet_nic/netxtremeii.php
>
> I'm interested in fixing this issue. But I would feel more motivated to
> make this a high priority if you can verify that the client also works
> well with a Netxtreme adapter that has the LSO feature disabled. If so,
> fixing the Intel card LSO issue should also have a high probability of
> resolving your Broadcom Netxtreme issue as well.
>

A bit more information on BACS and LSO options ...

http://support.dell.com/support/edocs/network/broadcom/r125875/en/bacs.htm

-Matthew