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

On Wed, Oct 18, 2017 at 10:26 AM, Sven Hartge <sven@svenhartge.de> wrote:
Nicholas Geovanis <nickgeovanis@gmail.com> wrote:

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

Thanks Sven, I later ran across the bugzilla. Unfortunately we are at ESXi 5.5 for at least the rest of the year, so that route is closed for now.

Have you tried the "ethtool WXYZ -G rx-mini 0" workaround?
I receive messages:
rx-mini unmodified, ignoring
no ring parameters changed, aborting

However ethtool reports that rx-mini is already 0:
root@saltlab05:~# ethtool -g ens192
Ring parameters for ens192:
Pre-set maximums:
RX:             4096
RX Mini:        0
RX Jumbo:       4096
TX:             4096
Current hardware settings:
RX:             256
RX Mini:        0
RX Jumbo:       128
TX:             512

Have you tried the vmx file change?
vmxnet3.rev.30 = FALSE

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


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