> > My systems are presently in the midst of an install but I should be
> > able to demonstrate it in the morning (US Pacific time, modulo the
> > shuttle service of a car repair place)
>
> stack@np-cp1-comp0002-mgmt:~$ ./netperf -H np-cp1-comp0001-guest -- -G
> 1400 -P 12867 -O throughput,transport_mss MIGRATED TCP STREAM TEST from
> 0.0.0.0 (0.0.0.0) port 12867 AF_INET to np-cp1-comp0001-guest () port 12867
> AF_INET : demo Throughput Transport
> MSS
> bytes
>
> 3372.82 1388
...
> root@np-cp1-comp0001-mgmt:/home/stack# tcpdump -n -r foo.pcap | fgrep -v
> "length 0" | awk '{sum += $NF}END{print "Average:",sum/NR}'
> reading from file foo.pcap, link-type EN10MB (Ethernet)
> Average: 2741.93
Yes, it's a known FW limitation - if MSS is smaller than configured MTU,
aggregation will be closed on 2nd packet; It might get changed in some future
FW version. But I agree it reinforces the need of having some kind of
user-knob for controlling this offloaded feature.
