Re: [PATCH] netfilter: use idr instead of list to speed up packet lookup by id

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On Wed, Apr 7, 2010 at 10:16 PM, Patrick McHardy <kaber@xxxxxxxxx> wrote:
>
> You only know that during runtime, so this will get more complicated
> than necessary. Why not simply use a hash table with a size specified
> by userspace in the queue creation command?  The default behaviour
> would be a size of 1, which is equivalent to the currently used single
> list.
>

We'd better not expose too many internal implementation details to
userspace. If we do so, we can't change its implementation easily
later. And letting user choose the size of hash table is much like the
orginal epoll(2) design, there will be security consern, such as too
much memory usage.



-- 
Regards,
Changli Gao(xiaosuo@xxxxxxxxx)
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