Re: [PATCH ipvs-next] ipvs: Remove rcu_read_unlock();rcu_read_lock();

To: Julian Anastasov <ja@xxxxxx>
Subject: Re: [PATCH ipvs-next] ipvs: Remove rcu_read_unlock();rcu_read_lock();
Cc: Simon Horman <horms@xxxxxxxxxxxx>, lvs-devel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, netfilter-devel@xxxxxxxxxxxxxxx, Wensong Zhang <wensong@xxxxxxxxxxxx>
From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Date: Fri, 26 Apr 2013 02:59:26 +0200
Hi Julian,

On Thu, Apr 25, 2013 at 11:15:25AM +0300, Julian Anastasov wrote:
>       Hello,
> On Thu, 25 Apr 2013, Simon Horman wrote:
> > It is unclear to me that there is any utility in the following:
> > 
> >      rcu_read_unlock();
> >      rcu_read_lock();
>       I thought it is a good idea for fixed hash table
> of IP_VS_TAB_BITS=20. May be if guarded by
>       if (!((++idx) & 4095))
> to reduce its rate to 256 (with idx++ removed from the for loop) ?
>       Netfilter has no such logic for nf_conntrack because
> it has limit of 16384 rows.

We seem to be supporting over that limit via module_param and sysfs:


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