I'm trying to debug a network performance issue.
I have two servers running SmartOS (20140613T024634Z and 20140501T225642Z), one
is a Supermicro dual Xeon E5649 (64 GB RAM) and the other is a dual Xeon
E5-2620v2 (128 GB RAM). Each has an Intel X520-DA1 10GbE card, and they are
both connected to 10GbE ports on a NetGear GS752TXS switch.
The switch reports 10GbE links:
1/xg49 Enable 10G Full 10G Full Link Up Enable
1518 20:0C:C8:46:C8:3E 49 49
1/xg50 Enable 10G Full 10G Full Link Up Enable
1518 20:0C:C8:46:C8:3E 50 50
as do both hosts:
[root@90-e2-ba-00-2a-e2 ~]# dladm show-phys
LINK MEDIA STATE SPEED DUPLEX DEVICE
igb0 Ethernet down 0 half
igb0
igb1 Ethernet down 0 half
igb1
ixgbe0 Ethernet up 10000 full
ixgbe0
[root@00-1b-21-bf-e1-b4 ~]# dladm show-phys
LINK MEDIA STATE SPEED DUPLEX DEVICE
igb0 Ethernet down 0 half
igb0
ixgbe0 Ethernet up 10000 full
ixgbe0
igb1 Ethernet down 0 half
igb1
Per dladm show-linkprop, maxbw is not set on either of the net0 vnic interfaces.
And yet, as measured via netcat, throughput is just below 1 Gbit/s:
[root@90-e2-ba-00-2a-e2 ~]# time cat /zones/test/10gb | nc -v -v -n
192.168.168.5 8888
Connection to 192.168.168.5 8888 port [tcp/*] succeeded!
real 1m34.662s
user 0m11.422s
sys 1m53.957s
(In this test, 10gb is a test file that is warm in RAM and transfers via dd to
/dev/null at approx. 2.4 GByte/s.)
What could be causing the slowdown, and how might I go about debugging this?
FTR, disk throughput, while not an issue here, appears to be perfectly
reasonable, approx. 900 MB/s read performance.
Thanks for any pointers!
Chris
-------------------------------------------
smartos-discuss
Archives: https://www.listbox.com/member/archive/184463/=now
RSS Feed: https://www.listbox.com/member/archive/rss/184463/25769125-55cfbc00
Modify Your Subscription:
https://www.listbox.com/member/?member_id=25769125&id_secret=25769125-7688e9fb
Powered by Listbox: http://www.listbox.com
