[lvs-users] Reasonable(?) Performance of LVS-NAT

daryl herzmann akrherz at iastate.edu
Thu May 23 17:12:31 BST 2013

On Thu, 23 May 2013, David Coulson wrote:

> On 5/23/13 11:04 AM, daryl herzmann wrote:
>> Greetings,
>> I have a LVS-NAT web cluster that seems to be nicely chugging along.  My
>> LVS director has the following specs:
>>     - Dell OptiPlex 745
>>     - Intel(R) Pentium(R) D CPU 3.40GHz
>>     - 4 GB Memory
>>     - BCM5754 Gigabit Ethernet PCI Express (two ports) [gro is disabled!]
> I was told by RedHat the GRO issue is fixed in RHEL6.4 - Not had chance to 
> test it yet.

Thanks, it appears this is the relevant bug?


I did a test of this:

# ethtool -k eth1
Features for eth1:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: off

and the problem did not appear to go away.  The traffic through the 
director was extremely sluggish, so I failed back to having 'gro off', 


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