netdev - Re: vmxnet3 LROv6 performance issues

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Message-ID: <loom.20160706T230733-0@post.gmane.org>
Date:	Wed, 6 Jul 2016 21:10:03 +0000 (UTC)
From:	Ramprasad K S <ksrbhat@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: vmxnet3 LROv6 performance issues

Bernhard Schmidt <berni <at> birkenwald.de> writes:

> 
> Hi,
> 
> this started as a Debian bug
> (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=816377), but since
> it's affecting SLES as well I'm hoping to get some help here.
> 
> I'm a bit unsure where to search here. It is definitely
> hardware/firmware and/or ESXi related. OTOH the VMware-Tools vmxnet3
> driver seems to do something very different from the in-kernel driver.
> 
> Best Regards,
> Bernhard

This is due to check sum handling issue in the vmxnet3 driver. Fix is on 
the kernel tree. 
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-
stable.git/commit/drivers/net/vmxnet3?
id=f0d437809d23999cb25207cfbe80c61e5703fdc1

I have tested the fix and confirmed to resolve the performance issue with 
LRO. 

Thanks
Ram