Re: [Lse-tech] Re: A common layer for Accounting packages

On Mon, 2005-02-28 at 19:17 +0300, Evgeniy Polyakov wrote:

On 28 Feb 2005 10:31:33 -0500
jamal [off-list ref] wrote:

quoted

I would bet the benefit you are seeing has to do with batching rather
than such an optimization flag. Different ballgame.
I relooked at their code snippet, they dont even have skbs built nor
even figured out what sock or PID. That work still needs to be done it
seems in cn_netlink_send(). So probably all they need to do is move the
check in cn_netlink_send() instead. This is assuming they are not
scratching their heads with some realted complexities.

[...]
As connector author, I still doubt it worth copying several lines 
from netlink_broadcast() before skb allocation in cn_netlink_send().
Of course it is easy and can be done, but I do not see any profit here.
Atomic allocation is fast, if it succeds,  but there are no groups/socket to send,
skb will be freed, if allocation fails, then group check is useless.

I would prefer Guillaume Thouvenin as fork connector author to test
his current implementation and show that connector's cost is negligible
both with and without userspace listeners.
As far as I remember it is first entry in fork connector's TODO list.

I tested without user space listeners and the cost is negligible. I will
test with a user space listeners and see the results. I'm going to run
the test this week after improving the mechanism that switch on/off the
sending of the message.

Best regards,
Guillaume