[ovirt-users] 答复: bonding 802.3ad mode

[Nathanaël Blanchet]

Hello, thanks for the explanation, but I did'nt find any reason about 
incompatibility between mode 0 and bridge... Can you give me some 
sources about this? Ovirt doesn't actually allow it, so it must exist a 
good reason for that.
But for my own, I have several single kvm hosts that support bridge over 
bonding in mode 0 and vms run fine on it...
So, someone can share his experience about this kind of detail?

ps: ovirt has a field for configuring custom mode whereas mode 0 is not 
listed in the predifined list, I didn't make any test, but it seem to be 
at least possible.

Le 19/03/2015 03:57, Dan Yasny a écrit :
> Mode 0 is not supported under a bridge, just like mode 6
>
> On Wed, Mar 18, 2015 at 10:47 PM, Xie, Chao <xiec.fnst at cn.fujitsu.com 
> <mailto:xiec.fnst at cn.fujitsu.com>> wrote:
>
>     Yeah, Alex is right. And if you want to double the network’s speed
>     in single flow, the mode 0 is only choice. But mode 0 seems not be
>     supported in oVirt?
>
>     *发 件人:*users-bounces at ovirt.org <mailto:users-bounces at ovirt.org>
>     [mailto:users-bounces at ovirt.org <mailto:users-bounces at ovirt.org>]
>     *代 表 *Alex Crow
>     *发 送时间:*2015年3月19日0:25
>     *收件人:*users at ovirt.org <mailto:users at ovirt.org>
>     *主题:*Re: [ovirt-users] bonding 802.3ad mode
>
>     The balancing on 802.3ad only occurs for different network flows
>     based on a hash of source and destination MAC (or can be made to
>     add IP addresses into the calculation). A single flow will only
>     use a single NIC in ad mode.
>
>     Alex
>
>
>     On 18/03/15 16:17, Nathanaël Blanchet wrote:
>
>         Hi all,
>
>         I'm used to create a mode 4 bond0 interface with two 1 Gb/s
>         interfaces on all my hosts, and ethtool bond0 gives me a
>         functionnal 2000Mb/s. However, when importing a vm from the
>         export domain (NFS with a speed of 4GB/s), I always have this
>         alert:
>
>         "Host siple has network interface which exceeded the defined
>         threshold [95%] (em3: transmit rate[0%], receive rate [100%])"
>         It seems that the second nic never works while the first one
>         is overloaded.
>         Is it an expected behaviour? I believed that the flow was
>         balanced between the two interfaces in 802.3ad mode.
>
>
>
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