Kernel dumps [was Re: possible changes from Panzura]

[Julian Elischer]

On 7/12/13 10:01 PM, Ed Maste wrote:
> On 10 July 2013 19:07, Vincent Hoffman <vince at unsane.co.uk> wrote:
>> There was some work on something similar at one point, not sure what
>> came of it.
>> http://lists.freebsd.org/pipermail/freebsd-current/2010-September/020164.html
> The code referenced there has been used in production since 2005 or
> so, and is based on an earlier implementation for FreeBSD 4.x that
> dates to 2000.  Despite some shortcomings in the implementation it has
> proved quite reliable in practice.
>
> It hasn't made it into the tree yet for reasons raised in this thread.
>   The primary issue is that it allocates mbufs in the packet sending
> path, and so relies on a number of kernel subsystems to be in a
> consistent state.  It doesn't use the stack, routing table, or driver
> interrupt interfaces though.  It could likely be made committable with
> a relatively small effort to switch to preallocating an mbuf+cluster
> or two at configuration time.
>
> More information is on the FreeBSD wiki, at https://wiki.freebsd.org/Netdump

I would say this is one of the features I've looked for a LOT over the 
last 20 years.

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