[ovirt-users] 答复: bonding 802.3ad mode

[Dan Kenigsberg]

On Wed, Mar 18, 2015 at 10:57:18PM -0400, Dan Yasny wrote:
> 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>
> 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] *代表 *Alex
> > Crow
> > *发送时间:* 2015年3月19日 0:25
> > *收件人:* 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.

To follow up on former ressponses: what do you have on top of your bond?
If you have a VM network, multiple guests are expected to have a
different hash value for each, and to spread the load on mode 4.

If you use the bonds for a host network (e.g. dispaly, migration,
storage) you can try mode 0.