On 2020-07-23 21:26, Bjoern A. Zeeb wrote:
That’ll probably work; still, the deferred teardown work seems wrong to
me; I haven’t investigated; the patch kind-of says exactly that as
well: if “wait until deferred stuff is done” is all we are doing, why
can we not do it on the spot then?
Hi Bjoern,
Trying to move the discussion over to Phabricator at:
https://reviews.freebsd.org/D24914
The answer to your question I believe is this commit:
https://svnweb.freebsd.org/base/head/sys/netinet/in_mcast.c?revision=333175&view=markup
It affects both IPv4 and IPv6.
I know that sometimes multicast entries can be freed from timer
callbacks. I think having a task, probably one is enough, for network
related configuration is acceptable. With D24914 there will be two
threads to teardown which is probably overkill, but anyway makes a solid
solution for now.
I don't know why Stephen didn't think about draining those tasks. I know
some people are not actively using VIMAGE and that might be the reason.
--HPS
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