site_archiver@lists.apple.com Delivered-To: macnetworkprog@lists.apple.com Thread-index: AQHU3zlXChX15mALp0GWFpHMcStyuqYUxLYAgAFQQwA= 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 <vlubet@apple.com> 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 <ssudre@intego.com> 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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