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Hi All, Some more data on this, I've reproduced this on another host that's a completely stock centos/xen deployment with a centos 6.6 domU. Since I?m seeing the retransmissions on the VIF, I don't think it's related to the network stack but just in case.. Each host is connected via LACP with vlan tagging to a pair of stacked cisco 3750's. Host networking config is here:

Hi All, I've tracked this down... We do rate limiting of our vms with a mix of ebtables/tc. Running these commands (replace vif1.0 with the correct vif for your VM) will reproduce this: ebtables -A FORWARD -i vif1.0 -j mark --set-mark 990 --mark-target CONTINUE tc qdisc add dev bond0 root handle 1: htb default 2 tc class add dev bond0 parent 1: classid 1:0 htb rate 10000mbit tc class

Hi All, Was troubleshooting some odd VM network issues and discovered that we're seeing dropped packets + retransmissions across multiple domU OS's and dom0 hardware platforms. xendev01 ~ # tshark -R "tcp.analysis.retransmission " -i vif7.0 Running as user "root" and group "root". This could be dangerous. Capturing on vif7.0 3.054257

...rt-bounces at centos.org [mailto:centos-virt- > bounces at centos.org] On Behalf Of Nathan March > Sent: Wednesday, April 15, 2015 1:13 PM > To: 'Discussion about the virtualization on CentOS' > Subject: Re: [CentOS-virt] Seeing dropped packets / tcp retrans on latest > 4.4.1-10el6 > > Hi All, > > Some more data on this, I've reproduced this on another host that's a > completely stock centos/xen deployment with a centos 6.6 domU. > > Since I?m seeing the retransmissions on the VIF, I don't think it's related to > the network stack bu...