Re: VLAN trunking and fragmentation

On Fri, Mar 21, 2008 at 02:28:24PM +0100, Giulio Ferro wrote:
Pyun YongHyeon wrote:

# ping -s 2000 192.168.100.2
PING 192.168.100.2 (192.168.100.2): 2000 data bytes
2008 bytes from 192.168.100.2: icmp_seq=0 ttl=64 time=0.264 ms
2008 bytes from 192.168.100.2: icmp_seq=1 ttl=64 time=1001.186 ms

[...]

2008 bytes from 192.168.100.2: icmp_seq=41 ttl=64 time=0.181 ms



It would be great if you could understand why this happens...


Try set tunable hw.re.msi_disable and let me know how it goes.
(Add hw.re.msi_disable="1" to /boot/loader.conf)


You're spot on!

----------------------------------
# ping -c 200 -s 1472 192.168.100.2
PING 192.168.100.2 (192.168.100.2): 1472 data bytes
1480 bytes from 192.168.100.2: icmp_seq=0 ttl=64 time=0.192 ms
1480 bytes from 192.168.100.2: icmp_seq=1 ttl=64 time=0.151 ms
1480 bytes from 192.168.100.2: icmp_seq=2 ttl=64 time=0.155 ms
1480 bytes from 192.168.100.2: icmp_seq=3 ttl=64 time=0.150 ms
1480 bytes from 192.168.100.2: icmp_seq=4 ttl=64 time=0.151 ms
1480 bytes from 192.168.100.2: icmp_seq=5 ttl=64 time=0.149 ms
1480 bytes from 192.168.100.2: icmp_seq=6 ttl=64 time=0.153 ms
1480 bytes from 192.168.100.2: icmp_seq=7 ttl=64 time=0.149 ms
[...]
--- 192.168.100.2 ping statistics ---
200 packets transmitted, 200 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.148/0.159/1.472/0.093 ms
----------------------------------

What does that tunable do?


That tunable disables the use of MSI which is believed to be
preferred way to deliver interrtups on recent hardwares that
supports MSI. But it seems that some variants of RealTek hardware
doesn't seem to work correctly with MSI.

--
Regards,
Pyun YongHyeon
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