Re: [Xen-devel] [Xen-users] vif-bridge errors when creating and destroying dozens of VMs simultaneously

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 17/05/17 13:43, Ian Jackson wrote:
> George Dunlap writes ("Re: [Xen-devel] [Xen-users] vif-bridge errors when 
> creating and destroying dozens of VMs simultaneously"):
>> So we have three options:
> ...
>> 3. Try to check to see if the version of iptables we have supports -w,
>> and use it if available.  This should also work on all systems, but
>> introduces a bit of complication.  It also doesn't allow us to
>> reliably use a timeout.
> 
> I think this is best.  Eventually we can get rid of the check for -w.
> 
> I think a timeout in this context is not very helpful.
> 
> Also, a loop, on a busy system, might need to have many attempts,
> because it will be polling.

FWIW the iptables internal mechanism will try to grab the lock, and if
it fails (and -w is set), will call sleep(1) before trying again.  My
bash loop would do exactly the same thing.

But I agree that if timeouts are not important, doing it via iptables is
probably cleaner.  Let me work up a patch.

 -George


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