Denis V. Lunev wrote:
Daniel Lezcano wrote:
Denis V. Lunev wrote:
Daniel Lezcano wrote:
Denis V. Lunev wrote:
Daniel Lezcano wrote:
* the first one is the locking of the network namespace list by
rtnl_lock, so from the timer callback we can not browse the network
namespace list to check the age of the routes. It is a problem I would
like to talk with Denis if he has time
From my point of view, the situation is clear. The timer should be
per/namespace. The situation is completely different as one in IPv4.
We thought to make a timer per namespace for ipv6, but we are a little
afraid for the performances when there will be a lot of containers.
Anyway, we can do a timer per namespace and optimize that later. I will
cook a new patch to take into account that for the next week.
IMHO not a problem. tcp_write_timer is per/socket timer. If this works
efficiently, per/namespace one will work also.
That's right, this is a good argument. By the way, the amount of work to
be done in the tcp_write_timer is perhaps smaller than the one done in
the ipv6 routing age check, no ? Anyway, I'm not against a timer per
namespace in this case, I already did a try before rolling back to a
for_each_net in the gc timer, that changes a little the API, but nothing
we can handle easily.
I think you are wrong. The amount of work to "purge" all namespaces is a
constant in the IPv6 case, where we'll have per/namespace cache. So, for
a multiple timers model only multiple timer overhead counts and this
overhead is small, as timer list is efficient.
This argument does not for for IPv4 case, where there is a one big cache
for all namespaces.
Interesting, thanks for the precision.
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