Re: [pve-devel] Google patch - fix a critical fail in Linux kernel for TCP protocol

[Michael Rasmussen]

On Tue, 29 Sep 2015 08:08:27 +0200 (CEST)
Alexandre DERUMIER  wrote:

> >>Ok, but i guess that if we have several VMs into a Server, the problem be 
> >>multiplied  
> I'm not sure, because each vm have control of his own tcp congestion.
> 
> (if it's bridged, the host shouldn't do nothing)
> 
From what I have read it seems that this is mostly an issue if one side
of the connection has mush more bandwidth that the other side. All been
equal in a proxmox cluster all connections should more or less have the
same capabilities.

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Re: [pve-devel] Google patch - fix a critical fail in Linux kernel for TCP protocol

[Alexandre DERUMIER]

>>Ok, but i guess that if we have several VMs into a Server, the problem be 
>>multiplied
I'm not sure, because each vm have control of his own tcp congestion.

(if it's bridged, the host shouldn't do nothing)


- Mail original -
De: "Cesar Peschiera" 
À: "pve-devel" 
Envoyé: Mardi 29 Septembre 2015 07:44:25
Objet: Re: [pve-devel] Google patch - fix a critical fail in Linux kernel   
for TCP protocol

> This is not a critical bug it merely affects network performance. 

Ok, but i guess that if we have several VMs into a Server, the problem be 
multiplied 


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Re: [pve-devel] Google patch - fix a critical fail in Linux kernel for TCP protocol

[Cesar Peschiera]

@Alexandre DERUMIER:

I'm not sure, because each vm have control of his own tcp congestion.

(if it's bridged, the host shouldn't do nothing)


Ohh, ok, it isn't a great problem (i use KVM VM).
Many thanks for the clarification.

And please let me to do a question:
Is the same for conatiners (LCX or OpenVZ)?

@Michael Rasmussen:

From what I have read it seems that this is mostly an issue if one side
of the connection has mush more bandwidth that the other side. All been
equal in a proxmox cluster all connections should more or less have the
same capabilities.


Many thanks for the prompt reply,
and please let me to do a question:

I have a PVE cluster, only two servers of them has NICs of 10 Gb/s for:
- LAN communication
- PVE Cluster
- LAN for VMs
(other NICs are used for DRBD and backups)

Also configurated in LACP mode (2 ports in each server)

The rest of servers has NICs of 1 Gb/s. (LACP mode, 2 ports in each server) 
for:

- LAN communication
- PVE Cluster
- LAN for VMs
(other NICs are used for DRBD and backups)

The question:
Do i have this problem? 


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Re: [pve-devel] Google patch - fix a critical fail in Linux kernel for TCP protocol

[Cesar Peschiera]

This is not a critical bug it merely affects network performance.


Ok, but i guess that if we have several VMs into a Server, the problem be 
multiplied



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Re: [pve-devel] Google patch - fix a critical fail in Linux kernel for TCP protocol

[Michael Rasmussen]

On Tue, 29 Sep 2015 01:24:36 -0400
"Cesar Peschiera"  wrote:

> 
> My Question:
> What will be the policy of PVE about of this?
> 
This is not a critical bug it merely affects network performance.

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Michael Rasmussen

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