Re: Network Kernel Extension vs Thunderbolt 3?
Re: Network Kernel Extension vs Thunderbolt 3?
- Subject: Re: Network Kernel Extension vs Thunderbolt 3?
- From: Stéphane Sudre <email@hidden>
- Date: Thu, 21 Mar 2019 13:26:39 +0000
- Thread-topic: Network Kernel Extension vs Thunderbolt 3?
Thanks for the information.
Indeed, a MSS around 1500 is what is being observed in this case.
I guess trying to re-enable this option from a specific NKE is pointless since
there can be other NKEs involved.
> On Mar 20, 2019, at 6:23 PM, Vincent Lubet <email@hidden> wrote:
>
> When installing an interface filter disables TSO (TCP Segmentation Offload)
> for the interface and this lead TCP to clamp the MSS from 64K to 1500.
>
> This is done because some interface filters do not process correctly packets
> larger than the interface MTU
>
> Vincent
>
>> On Mar 20, 2019, at 9:24 AM, Stéphane Sudre <email@hidden> wrote:
>>
>> Just out of curiosity, is there any known issue in macOS 10.14.x where the
>> simple presence of a network kernel extension significantly slows down
>> network transfers through Thunderbolt 3 connectors but not through classic
>> Ethernet connectors?
>>
>> For instance by automatically reducing the MTU size if a network kernel
>> extension is enabled.
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