[CentOS] Centos v6.8 and double received bytes

Steve Malenfant smalenfant at gmail.com
Fri Sep 2 00:51:44 UTC 2016


I'm observing double the amount of "recv" bytes in latest Centos v6.8 with
ixgbe 4.2.1-k.

Anybody seeing the same?

$ ethtool -i em1
driver: ixgbe
version: 4.2.1-k

$ uname -an
Linux chndcdmid01.rd.ph.cox.net 2.6.32-642.4.2.el6.x86_64 #1 SMP Tue Aug 23
19:58:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Doing comparison on 2 days at same hour just to show the difference. This
is an HTTP cache server, having higher RX than TX means something is bad...
We don't rely much on the RECV side, but our graph showed a huge difference
between upgrades.

Before upgrade (v6.7, 4.0.1-k) :
07:00:01 PM     IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s
txcmp/s  rxmcst/s
07:00:01 PM       em1   3971.90   5384.15  14981.65  26376.80      0.00
 0.00      0.00
07:10:01 PM       em1   3918.26   5367.79  13136.21  25528.40      0.00
 0.00      0.00
07:20:01 PM       em1   3868.94   5273.08  11997.37  25155.92      0.00
 0.00      0.00
07:30:01 PM       em1   3895.50   5597.56  10851.74  28583.84      0.00
 0.00      0.00
07:40:01 PM       em1   3956.80   5706.12  12230.66  29553.73      0.00
 0.00      0.00
07:50:01 PM       em1   4016.39   5801.69  11957.35  29979.04      0.00
 0.00      0.00

After upgrade (v6.8, 4.2.1-k) :
07:00:01 PM     IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s
txcmp/s  rxmcst/s
07:00:01 PM       em1  20857.40   8736.13  59710.07  35102.76      0.00
 0.00      0.00
07:10:01 PM       em1  19508.00   8429.40  58120.70  36036.64      0.00
 0.00      0.00
07:20:01 PM       em1  19128.20   8471.45  55502.07  37312.56      0.00
 0.00      0.00
07:30:01 PM       em1  19402.55   8329.93  53586.60  35386.52      0.00
 0.00      0.00
07:40:01 PM       em1  19188.27   8105.83  51463.72  33585.55      0.00
 0.00      0.00
07:50:01 PM       em1  19544.32   7843.08  49590.64  30981.99      0.00
 0.00      0.00

Steve



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