Alex -
On 11/14/2014 10:47 PM, Alexander Duyck wrote:
On 11/03/2014 12:32 PM, Tom Carroll wrote:
Good day list -
I don't know if this is the appropriate venue, but I need to start
somewhere. I have several dell laptops with the 82579LM controller,
running 3.6.13, 3.6.16 and driver e1000e 3.1.0.2/3.1.0.2-NAPI. Under
normal runtime configurations, the interface operates well and does not
drop packets. When promisc is enabled, netstat -i / cat
/sys/class/net/ethX/statistics/rx_dropped / report packet losses at
about two percent. Disabling promisc stems rx drop reports. ethtool -S
eth0 doesn't show any loss. And strangely, netstat -s ethX doesn't
report TCP retransmits commensurate to the level of loss. Other machines
with interfaces from different vendors do not report loss in this setup.
Where/how can I trace down the sources of the loss?
The rx_dropped counter reports packets that are dropped by the network
stack.
In your case I assume you are turning on promiscuous mode but must not
be enabling a raw socket that is accepting all incoming frames. As such
some of the frames received aren't for your local system or any systems
you might be routing/bridging to so they are dropped and reported via
rx_dropped.
A simple way to verify this is the case is to leave tcpdump running on
the interface in the background. You should see no rx_dropped errors
reported with it running since it would consume a copy of all incoming
frames.
Thank you for your replay. Even with tcpdump running, rx_dropped errors
stilled occurred. I traced the problem down to gro. Once I disabled gro,
the errors stopped.
~ Tom
------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://pubads.g.doubleclick.net/gampad/clk?id=154624111&iu=/4140/ostg.clktrk
_______________________________________________
E1000-devel mailing list
E1000-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/e1000-devel
To learn more about Intel® Ethernet, visit
http://communities.intel.com/community/wired
