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Bug#864642: Still getting the warning

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  Bug#864642: Still getting the warning Fabio Pedretti <fabio.pedretti@unibs.it> - 2018-06-05 12:10 +0200
    Bug#864642: Still getting the warning Fabio Pedretti <fabio.pedretti@unibs.it> - 2018-06-05 14:00 +0200
      Bug#864642: Still getting the warning Fabio Pedretti <fabio.pedretti@unibs.it> - 2018-06-05 14:10 +0200

#61152 — Bug#864642: Still getting the warning

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Hi, I am on ESXi 6.7 with a Debian 9 VM with 4.9.88-1+deb9u1 and still
getting the dmesg warning:

TCP: eth0: Driver has suspect GRO implementation, TCP performance may be
compromised.

Hopefully I won't have a crash having a recent ESXi (I just upgraded) but
what can be done about the message and the performance reduction implied?
Is there a workaround or the warning is just a false positive, having a
recent enough ESXi?

Thanks.

-- 
ing. Fabio Pedretti
Responsabile U.O.C. "Reti e Sistemi"
http://www.unibs.it/organizzazione/amministrazione-centrale/servizio-servizi-ict/uoc-reti-e-sistemi
Università degli Studi di Brescia
Via Valotti, 9 - 25121 Brescia
E-mail: fabio.pedretti@unibs.it

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#61153

It looks like the warning appeared with this first commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dcb17d22e1c2cd72e72190c736349a675362b3bc
but was later corrected with this second one:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0b9aefea860063bb39e36bd7fe6c7087fed0ba87

The first commit was merged in the 4.9 tree, but not the second one
(at least not up to 4.9.106), and was only merged in 4.11.

So I would conclude the warning may be harmless, unless you got it on
a >= 4.11 kernel. And I also verified I don't get it on such a newer
kernel.

I would close this bug, but it may eventually be nice to backport the
second commit in 4.9 to avoid the harmless warning.

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#61154

This issue is also on kernel bugzilla here:
https://bugzilla.kernel.org/show_bug.cgi?id=194569

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