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SubjectRe: [RFC PATCH 1/5] net: implement support for low latency socket polling
On 04/03/2013 16:52, Eric Dumazet wrote:
> On Mon, 2013-03-04 at 10:43 +0200, Eliezer Tamir wrote:
>
>> One could for example increment the generation id every time the RTNL is
>> taken. or is this too much?
>
> RTNL is taken for a lot of operations, it would be better to have a
> finer grained increment.

If is taken rarely enough it will still be worth it.

Otherwise it may be hard to know what operations need to invalidate the
napi reference. It can very well be HW dependent, and then you end up
adding a function for drivers to call to do the invalidation.

Or we can decide that we only care about catastrophic events and only
worry about a napi completely going away and not worry about
configuration changes.(Polling the wrong queue will not kill you, it's
just a waste of perfectly good CPU cycles.)


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