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Re: Debian 9.2, VSphere 6.5.0, "TCP performance may be compromised"

Nicholas Geovanis <nickgeovanis@gmail.com> wrote:

> I have a 9.2 system running in a VMware VM which receives the
> following message at startup which I've never seen before. The VMware
> network driver in use is VMXNET 3; the VMware tools daemon is running:

> kernel: TCP: ens192: Driver has suspect GRO implementation, TCP
> performance may be compromised

> There does not appear to be any actual networking or performance
> impact so far, but obviously this will be used eventually for
> higher-volume servers, so any performance impact is important. Does
> anyone have more info on this issue?

As long as you use at lease ESXi 6.5u1 there will be no problem. If you
are on pre-6.5u1, your Stretch VMs will freeze/crash after a short amount of
traffic because of a bug in those earlier ESXi releases.

See also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864642


Sigmentation fault. Core dumped.

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