TSO and FreeBSD vs Linux

[Kevin Oberman]

On Wed, Aug 14, 2013 at 12:46 PM, Julian Elischer <julian at freebsd.org>wrote:

> On 8/14/13 3:23 PM, Lawrence Stewart wrote:
>
>> On 08/14/13 16:33, Julian Elischer wrote:
>>
>>  They switched to using an initial window of 10 segments some time ago.
>>>> FreeBSD starts with 3 or more recently, 10 if you're running recent
>>>> 9-STABLE or 10-CURRENT.
>>>>
>>> I tried setting initial values as shown:
>>>    net.inet.tcp.local_slowstart_**flightsize: 10
>>>    net.inet.tcp.slowstart_**flightsize: 10
>>> it didn't seem to make too much difference but I will redo the test.
>>>
>> Assuming this is still FreeBSD 8.0 as you mentioned out-of-band,
>> changing those variables without disabling rfc3390 will have no effect.
>>
>> I think (check the driver code in question as I'm not sure) that if you
>> "ifconfig <if> lro" and the driver has hardware support or has been made
>> aware of our software implementation, it should DTRT.
>>
>
> so I ran on 9.2-beta ( a week or two old) and it had similar problems..
> only worse.. 9.2 actually sends multiple packets when is doesn't need to..
>     http://people.freebsd.org/~julian/fbsd9.png
>

Ack! (Sorry) I could have sworn that this had been fixed. Has it been
re-broken?
-- 
R. Kevin Oberman, Network Engineer
E-mail: rkoberman at gmail.com