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
https://www.reddit.com/r/homelab/comments/6s5dh6/debian_9_on_esxi_65u1_complete_lockup/
https://bugzilla.kernel.org/show_bug.cgi?id=191201#c49

Grüße,
Sven.

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