[RFC] Xend configuration option for console memory limit

[RFC] Xend configuration option for console memory limit

[Dan Smith]

Bug #296 describes the possible Out-Of-Memory outcome of a console
flood.  Currently, xenconsoled has the ability to obey a limit, but
Xend does not set it, to prevent console message loss.

I propose that a configuration option be added to xend-config.sxp that
sets the limit.  That way, a user with a large console buffer
requirement can easily set it, and OOM situations can be avoided.

I'll be happy to knock up a patch if this sounds reasonable.

Thoughts?

-- 
Dan Smith
IBM Linux Technology Center
Open Hypervisor Team
email: danms@us.ibm.com

Re: [RFC] Xend configuration option for console memory limit

[Anthony Liguori]

I think this is a reasonable solution.  One thing to discuss is what the 
default limit should be.  4k was the old limit w/xcs and that was 
obviously unacceptable.  Something like 1MB is probably more than 
enough.  I'm of course wary to see there being any possibility of 
console data loss but this is neccessary to avoid DoS attacks.

Regards,

Anthony Liguori

Dan Smith wrote:

>Bug #296 describes the possible Out-Of-Memory outcome of a console
>flood.  Currently, xenconsoled has the ability to obey a limit, but
>Xend does not set it, to prevent console message loss.
>
>I propose that a configuration option be added to xend-config.sxp that
>sets the limit.  That way, a user with a large console buffer
>requirement can easily set it, and OOM situations can be avoided.
>
>I'll be happy to knock up a patch if this sounds reasonable.
>
>Thoughts?
>
>  
>