Re: [CentOS-virt] Seeing dropped packets / tcp retrans on latest 4.4.1-10el6

2015-04-20 Thread George Dunlap
[cc'ing xen-users to see if anyone there has any familiarity with ebtables] On Fri, Apr 17, 2015 at 8:20 PM, Nathan March wrote: > 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

Re: [CentOS-virt] Seeing dropped packets / tcp retrans on latest 4.4.1-10el6

2015-04-17 Thread Nathan March
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 han

Re: [CentOS-virt] Seeing dropped packets / tcp retrans on latest 4.4.1-10el6

2015-04-15 Thread Nathan March
n 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. &

Re: [CentOS-virt] Seeing dropped packets / tcp retrans on latest 4.4.1-10el6

2015-04-15 Thread Nathan March
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 v

[CentOS-virt] Seeing dropped packets / tcp retrans on latest 4.4.1-10el6

2015-04-14 Thread Nathan March
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 c