[pve-devel] lost tcp packets in bridge

Stefan Priebe - Profihost AG s.priebe at profihost.ag
Wed Aug 30 19:52:45 CEST 2017


Am 22.08.2017 um 08:16 schrieb Alexandre DERUMIER:
> Hi Stefan,
> 
> No I don't have this behaviour. I only remember probleme with old debian wheezy with kernel 3.2,
> where I had this kind of problem. (seem to be a problem in virtio-net driver in 3.2)
> 
> 
> Do you known exactly where the packet is lost ? (do you have used tcpdump on tap interface too ?)
> 
> mtu size is enough big on bridge && taps vs mtu in your vms ?

currently i can't reproduce the issue - even i was for two days.
Currently i've no idea what has happend and will report back if it
happens again.

Thanks!

Greets,
Stefan


> 
> 
> ----- Mail original -----
> De: "Stefan Priebe, Profihost AG" <s.priebe at profihost.ag>
> À: "pve-devel" <pve-devel at pve.proxmox.com>
> Envoyé: Mardi 22 Août 2017 08:04:18
> Objet: [pve-devel] lost tcp packets in bridge
> 
> Hello, 
> 
> while running PVE 4.4 i'm observing lost tcp packets on a new cluster. 
> Two VMs are connected to the same bridge on the same host using virtio 
> and linux as a guest. 
> 
> But the target guest does not receive all tcp packets some get lost. I 
> see them leaving on the source using tcpdump but they do not arrive at 
> the target network card (checked using tcp dump). This results in 
> sometimes awfully slow performance as tcp retransmits happen. 
> 
> I already flushed all iptables rules - but this did not help. I can't 
> reproduce the issue it just happens "sometimes" with some packets. 
> 
> Has anybody already ovserved something like this? 
> 
> Greets, 
> Stefan 
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